Rename the implementation unit System.Generic_Packed_Arrays to Packed_Arrays
Move the implementation unit System.Generic_Compare_Arrays into System.Packed_Arrays
Separate some parsing subprograms for Ada-form literals from images directory
Make new directory */required containing the units required by compiler
Merge commit '0ea865f' into gcc-4.8

Conflicts:
	source/required/s-memory.ads (deleted)
Rename makefile to Makefile
Rename the directory mman to pools
Rename directories univ-* to machine-* because univ(universal) is the inappropriate word to add CPU-dependent files
Remark
Separate mapping signal or SEH to the Ada exception from System.Termination
Fix to support 64bit Windows (mingw-w64)
Merge commit 'f51c84a' into gcc-4.8

Conflicts:
	source/machine-w64-mingw32/s-staall.adb

Modifications:
	source/machine-w64-mingw32/x86_64/s-unwmap.adb
	source/machine-w64-mingw32/x86_64/seh/s-unwhan.adb