[Ada] gnatmake and project parser clean ups (3/n)

[Arnaud Charlet <charlet at adacore dot com>]

Further code refactoring, removal of global variables and unused subprogram
parameters in gnatmake's code and project manager.

2009-07-13  Emmanuel Briot  <briot@adacore.com>

	* gnatcmd.adb, prj-proc.adb, prj-proc.ads, make.adb, prj-part.adb,
	prj.adb, prj.ads, clean.adb, prj-nmsc.adb, prj-nmsc.ads, prj-pars.adb,
	prj-pars.ads, prj-conf.adb, prj-conf.ads, prj-env.adb, prj-tree.adb,
	prj-tree.ads: Minor reformatting.
	(Processing_Flags): New record to encapsulate the set of common
	parameters to several subprograms in the project manager.
	(Prj.Nmsc.Process_Naming_Scheme): renames Check, and moved to body
	Remove the need for the Current_Dir parameter in subprograms.
	(Look_For_Sources): minor refactoring, now that we no longer need to
	share subprograms between the two Ada_Only and Multi_Language modes
	(Processing_Flags): New field Error_On_Unknown_Language.
	Merge tests for library project between gnatmake and gprbuild.

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