Remark
Improve directory searching
Add new implementation unit System.File_Control and use it
Change implementation units belonging in Ada without "Inside" name to private
Reorder
Add Ada.Hierarchical_File_Names and implement filename operations for Windows
Merge branch 'master' (gcc-4.7, commit '2cdf78d') into gcc-4.6

Conflicts:
	source/directories/a-direct.ads