Use Raise_Exception_From_Here
Remark
Rename implementation unit Ada.Environment_Variables.Inside to System.Environment_Block (move from environment/univ-* to univ-*)
Change implementation unit System.Environment_Block to function
Separate implementation parts for POSIX platform from Ada.Command_Line and Ada.Environment_Variables
Improve makefile stopping ar from rearchiving libgnat.a if unnecessary
Reorder
Change Ada.Environment_Variables use no reference types and move string processing to implementation unit Inside
Merge branch 'master' (gcc-4.7, commit '56c73e7') into gcc-4.6

Conflicts:
	source/environment/a-envvar.ads