remove DOCS from default target and druntime.zip

- These are the raw b&w ddoc html files that nobody uses.

- The distributed druntime docs are generated
  by dlang.org (through the doc target).
move -version=CoreDdoc to DDOCFLAGS

- DOCFMT is typically overriden when calling
  the makefile.
Add internal documentation about Fibers
[ARM] Implement Fibers
Merge pull request #713 from jpf91/arm-3

[ARM] implement fibers & Add internal Fiber documentation
no need to GC scan the .rodata segment

- Also _deh_end will have to live in .data for PIC code
  (Bugzilla 11171), so it can't be used as end of .rodata.
Replace naked Read-Modify-Write ops on shared values which will be banned.
Merge pull request #714 from AndrejMitrovic/Prepare3672

Replace naked Read-Modify-Write ops on shared values which will be banned.
Remove uses of the comma operator
Merge pull request #716 from yebblies/commaop

[trivial] Remove uses of the comma operator
Merge pull request #715 from MartinNowak/dontScanRODATAonFBSD

[dll] FreeBSD must not GC scan .rodata
Replace AssociativeArray struct with UFCS methods
Merge pull request #668 from yebblies/fixaarray

Replace AssociativeArray struct with UFCS methods
Fix for issue 11981
Switch to using pthread_key_t for Thread reference on Posix
Use atomic ops in host test
pthread_key_delete(); Don't use pthread_key_t on OSX
missing else
Merge pull request #719 from radcapricorn/host_test_atomic_ops

DRuntime: Use atomic ops in host test
Merge pull request #718 from radcapricorn/issue_11981

Fix for issue 11981 - deadlock during thread initialization on Posix