re/charset.t: Allow to work on EBCDIC

This just converts the hard-coded character numbers to native, so will
work on any platform.
regcomp.c: Fix bug in EBCDIC

The POSIXA and NPOSIXA regnodes need to set the bits on only the ASCII
code points, but under EBCDIC those code points are 0-127.
XXX: Fixup commit message.

Fix UTF8_ACUUMULATE, utf8.c
XXX charnames.t: Make more EBCDIC friendly

Why need utf8::unicode_to_native
XXX make various things more EBCDIC friendly

Adds trailing white space errors
Need to know what to do about ^A meaning 0x1, and M-foo meaning meta
XXX regen/mk_PL_charclass.pl: Make EBCDIC friendly

need more of a commit message
XXX makedepend.SH: Why does 255 work and 250 not?
t/test.pl: Add comment about EBCDIC
Fix valid_utf8_to_uvchr() for EBCDIC
pp.c: White-space only

Make a ternary operation more clear
XXX temp skip perl5db.t
XXX temporary comment out multi-char folds
XXX regen/regcharclass.pl: maybe temp comment out utf8_char
regen/regcharclass.pl: make more EBCDIC friendly

One of the possible inputs to this process is a string.  This clarifies
that it must be specified in Unicode characters, and adds code to
translate it to native, if necessary.
feature/unicode_strings.t: Fix to work on EBCDIC
t/uni/class.t: Make work on EBCDIC
t/lib/charnames/alias: Fix some EBCDIC problems
t/re/fold_grind.t: Fixes for EBCDIC
t/op/quotemeta.t: EBCDIC fixes
lib/Unicode/UCD.t: Allow to run under EBCDIC,