add gc.config to configure profiling and pool limits through the command line
docs won't build because of missing variables in CoreDDoc mode
Move prefix member function attributes to postfix
remove try-catch from AA hashOf
implement aaLiteral
update deprecation of MAP_ANON from core.sys.posix.sys.mman

- remove MAP_ANON for linux from core.sys.posix.sys.mman
  (has been deprecated since sep 2013)

- add platform specific headers for mman (OSX, FreeBSD, Solaris, Android)

- add deprecation for other OSes
Revert "update deprecation of MAP_ANON from core.sys.posix.sys.mman"

This reverts commit 76962185d2b07865a9811cfe0107596db7460492.
Merge pull request #984 from IgorStepanov/hashOf-aa-safe

remove try-catch from AA hashOf
Merge pull request #933 from IgorStepanov/newaa-aaLiteral-and-aaInit

[new AA] implement aaLiteral
return Thread object in start method

- allows to write more concise code to start a Thread
Merge branch 'fixThreadDocs' into threadStartMethodChaining
Merge pull request #983 from 9rnsr/fix12931

Move prefix member function attributes to postfix
Merge pull request #972 from MartinNowak/fixThreadDocs

[trivial] docs won't build because of missing variables in CoreDDoc mode
Merge pull request #973 from MartinNowak/threadStartMethodChaining

return Thread object in start method
Merge pull request #817 from rainers/gc_config

make GC configurable through environment variable