Validate type before inserting into Gob

This fixes the crash caused by:
>> make gob! [pane: [make gob! []]]

because this code would cause "count" to be 0, and results in a
zero-sized series, which is now prohibited.
Report a generic error when command fails

Instead of failing silently and setting the result to unset!

>> reduce [reduce bind [text "hello"] import 'text]
** Command error: Command failed
** Where: text reduce reduce
** Near: text "hello"

More specific errors need to be added
Do not crash when no parent window was found

As this turns out to be more easily triggered than originallay
anticipated:
>> test: make gob! [flags: [no-title no-border on-top]]
>> view/as-is/no-wait test
REBOL Host Failure:
Parent window can't be found

However, the result might not be as expected.
[Linux] Fix the data format for the selection

The data is in UTF8 encoding. This fixes the missing trailing character
when copy & paste
[Linux] Try not return error when copying

Applications do not like error from copying, an empty content would make
more sense.
Remove the min size limit from system pool for always_malloc

or it will cause huge memory waste
Do not strip by default

to help the backtrace (not tested yet)
Add a /dump-series refinement to STATS

This is a debugging utility to dump all series in a pool. If the pool id
is negative, all series in the system will be dumped

>> stats/dump-series -1; dump all series in the system
...
>> stats/dump-series 4 ;dump all series in pool 4
...
Fix a heap-buffer-overflow

Found by AddressSanitizer:
==8157==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61d0000f5897 at pc 0x4816ef bp 0x7fffffffafb0 sp 0x7fffffffafa0
READ of size 1 at 0x61d0000f5897 thread T0
    #0 0x4816ee in Expand_Series ../src/core/m-series.c:138
    #1 0x4e258c in Insert_Gobs ../src/core/t-gob.c:219
    #2 0x4e7782 in T_Gob ../src/core/t-gob.c:833
    #3 0x42e26f in Do_Act ../src/core/c-function.c:338
    #4 0x42e9d8 in Do_Action ../src/core/c-function.c:396
    #5 0x41395b in Do_Next ../src/core/c-do.c:886
    #6 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #7 0x4883d6 in N_if ../src/core/n-control.c:632
    #8 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #9 0x41395b in Do_Next ../src/core/c-do.c:886
    #10 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #11 0x4893c0 in N_unless ../src/core/n-control.c:792
    #12 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #13 0x41395b in Do_Next ../src/core/c-do.c:886
    #14 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #15 0x488c03 in N_switch ../src/core/n-control.c:736
    #16 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #17 0x41395b in Do_Next ../src/core/c-do.c:886
    #18 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #19 0x4883d6 in N_if ../src/core/n-control.c:632
    #20 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #21 0x41395b in Do_Next ../src/core/c-do.c:886
    #22 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #23 0x42ea5c in Do_Function ../src/core/c-function.c:415
    #24 0x41395b in Do_Next ../src/core/c-do.c:886
    #25 0x415658 in Try_Block ../src/core/c-do.c:1083
    #26 0x4862f8 in N_attempt ../src/core/n-control.c:306
    #27 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #28 0x41395b in Do_Next ../src/core/c-do.c:886
    #29 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #30 0x493bb9 in Loop_Integer ../src/core/n-loop.c:131
    #31 0x49693a in N_for ../src/core/n-loop.c:486
    #32 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #33 0x41395b in Do_Next ../src/core/c-do.c:886
    #34 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #35 0x4883d6 in N_if ../src/core/n-control.c:632
    #36 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #37 0x41395b in Do_Next ../src/core/c-do.c:886
    #38 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #39 0x42ea5c in Do_Function ../src/core/c-function.c:415
    #40 0x41395b in Do_Next ../src/core/c-do.c:886
    #41 0x415658 in Try_Block ../src/core/c-do.c:1083
    #42 0x488f7d in N_try ../src/core/n-control.c:760
    #43 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #44 0x41395b in Do_Next ../src/core/c-do.c:886
    #45 0x4118a1 in Do_Args ../src/core/c-do.c:668
    #46 0x413700 in Do_Next ../src/core/c-do.c:879
    #47 0x4118a1 in Do_Args ../src/core/c-do.c:668
    #48 0x413700 in Do_Next ../src/core/c-do.c:879
    #49 0x414f2f in Do_Block_Value_Throw ../src/core/c-do.c:1048
    #50 0x5725ac in Parse_Rules_Loop ../src/core/u-parse.c:830
    #51 0x5731f8 in Parse_Rules_Loop ../src/core/u-parse.c:927
    #52 0x56c799 in Parse_Series ../src/core/u-parse.c:96
    #53 0x576950 in N_parse ../src/core/u-parse.c:1269
    #54 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #55 0x41395b in Do_Next ../src/core/c-do.c:886
    #56 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #57 0x4883d6 in N_if ../src/core/n-control.c:632
    #58 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #59 0x41395b in Do_Next ../src/core/c-do.c:886
    #60 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #61 0x42ea5c in Do_Function ../src/core/c-function.c:415
    #62 0x41395b in Do_Next ../src/core/c-do.c:886
    #63 0x415658 in Try_Block ../src/core/c-do.c:1083
    #64 0x4862f8 in N_attempt ../src/core/n-control.c:306
    #65 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #66 0x41395b in Do_Next ../src/core/c-do.c:886
    #67 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #68 0x487b91 in N_do ../src/core/n-control.c:524
    #69 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #70 0x41395b in Do_Next ../src/core/c-do.c:886
    #71 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #72 0x487fcb in N_either ../src/core/n-control.c:598
    #73 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #74 0x41395b in Do_Next ../src/core/c-do.c:886
    #75 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #76 0x487fcb in N_either ../src/core/n-control.c:598
    #77 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #78 0x41395b in Do_Next ../src/core/c-do.c:886
    #79 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #80 0x487fcb in N_either ../src/core/n-control.c:598
    #81 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #82 0x41395b in Do_Next ../src/core/c-do.c:886
    #83 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #84 0x42ea5c in Do_Function ../src/core/c-function.c:415
    #85 0x4198c2 in Apply_Function ../src/core/c-do.c:1524
    #86 0x419fa8 in Do_Sys_Func ../src/core/c-do.c:1584
    #87 0x41e406 in Init_Mezz ../src/core/c-do.c:2313
    #88 0x405fd3 in RL_Start ../src/core/a-lib.c:167
    #89 0x59d1f7 in main ../src/os/host-main.c:231
    #90 0x7ffff571403f in __libc_start_main (/usr/lib/libc.so.6+0x2003f)
    #91 0x405858 (/home/zsx/work/r3.git/make/r3-view-linux+0x405858)

0x61d0000f5897 is located 7 bytes to the right of 2064-byte region [0x61d0000f5080,0x61d0000f5890)
allocated by thread T0 here:
    #0 0x7ffff6f56b77 in __interceptor_malloc (/usr/lib/libasan.so.1+0x57b77)
    #1 0x47c300 in Make_Mem ../src/core/m-pools.c:125
    #2 0x47ca2f in Fill_Pool ../src/core/m-pools.c:233
    #3 0x47d80c in Make_Series ../src/core/m-pools.c:388
    #4 0x4826f3 in Copy_Series ../src/core/m-series.c:261
    #5 0x43ca14 in Copy_Deep_Values ../src/core/f-blocks.c:131
    #6 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #7 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #8 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #9 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #10 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #11 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #12 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #13 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #14 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #15 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #16 0x43cb82 in Copy_Deep_Values ../src/core/f-blocks.c:136
    #17 0x43cd30 in Copy_Block_Values ../src/core/f-blocks.c:159
    #18 0x43cd9f in Clone_Block ../src/core/f-blocks.c:174
    #19 0x42db12 in Clone_Function ../src/core/c-function.c:266
    #20 0x43cc00 in Copy_Deep_Values ../src/core/f-blocks.c:139
    #21 0x43cd30 in Copy_Block_Values ../src/core/f-blocks.c:159
    #22 0x4fd371 in T_Object ../src/core/t-object.c:364
    #23 0x42e26f in Do_Act ../src/core/c-function.c:338
    #24 0x42e9d8 in Do_Action ../src/core/c-function.c:396
    #25 0x41395b in Do_Next ../src/core/c-do.c:886
    #26 0x4133cc in Do_Next ../src/core/c-do.c:860
    #27 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #28 0x493bb9 in Loop_Integer ../src/core/n-loop.c:131
    #29 0x49693a in N_for ../src/core/n-loop.c:486

SUMMARY: AddressSanitizer: heap-buffer-overflow ../src/core/m-series.c:138 Expand_Series
Shadow bytes around the buggy address:
  0x0c3a80016ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3a80016ad0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3a80016ae0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3a80016af0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3a80016b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c3a80016b10: 00 00[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3a80016b20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3a80016b30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3a80016b40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3a80016b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3a80016b60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Contiguous container OOB:fc
  ASan internal:           fe
==8157==ABORTING

This is happening because "GOB_TAIL(gob) = count" sets the tail of a
series with length of "count" to be "count", and Expand_Series expects
a terminator in the series. (m-series.c:90 size  = (series->tail + 1) * wide;)
Free resource when window closes

Fix a memory leak, found by address sanitizer of GCC
Fix a memory leak

Reported by AddressSanitizer of GCC:
Direct leak of 970518528 byte(s) in 947772 object(s) allocated from:
    #0 0x7f505036363f in operator new[](unsigned long) (/usr/lib/libasan.so.1+0x5863f)
    #1 0x65676f in agg::agg_graphics::agg_gradient_pen(int, double, double, double, double, double, double, double, unsigned char*, double*, int) ../src/agg/agg_graphics.cpp:1306
    #2 0x5fe247 in rebdrw_gradient_pen ../src/os/host-draw-api-agg.cpp:184
    #3 0x5f8834 in RXD_Draw ../src/os/host-draw.c:294
    #4 0x45cd8e in Do_Commands ../src/core/f-extension.c:579
    #5 0x40680d in RL_Do_Commands ../src/core/a-lib.c:376
    #6 0x603d21 in rebdrw_gob_draw ../src/os/host-draw-api-agg.cpp:567
    #7 0x60c732 in process_gobs ../src/os/linux/host-compositor.c:520
    #8 0x60cb55 in process_gobs ../src/os/linux/host-compositor.c:559
    #9 0x60cb55 in process_gobs ../src/os/linux/host-compositor.c:559
    #10 0x60cb55 in process_gobs ../src/os/linux/host-compositor.c:559
    #11 0x60cb55 in process_gobs ../src/os/linux/host-compositor.c:559
    #12 0x60f753 in rebcmp_compose ../src/os/linux/host-compositor.c:685
    #13 0x5e8299 in Draw_Window ../src/os/host-view.c:225
    #14 0x5e8682 in Show_Gob ../src/os/host-view.c:288
    #15 0x5e8b58 in RXD_Graphics ../src/os/host-view.c:346
    #16 0x45bf75 in Do_Command ../src/core/f-extension.c:456
    #17 0x41395b in Do_Next ../src/core/c-do.c:886
    #18 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #19 0x42ea5c in Do_Function ../src/core/c-function.c:415
    #20 0x41395b in Do_Next ../src/core/c-do.c:886
    #21 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #22 0x42ea5c in Do_Function ../src/core/c-function.c:415
    #23 0x41395b in Do_Next ../src/core/c-do.c:886
    #24 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #25 0x4883d6 in N_if ../src/core/n-control.c:632
    #26 0x42dd9c in Do_Native ../src/core/c-function.c:289
    #27 0x41395b in Do_Next ../src/core/c-do.c:886
    #28 0x414b73 in Do_Blk ../src/core/c-do.c:1016
    #29 0x496d2f in N_forever ../src/core/n-loop.c:532
CALL with IO redirection

Only implemented on Linux for now.
Implement a R2-like non-blocking CALL
Merge branch 'call' into coverity_scan