prj.adb (Project_Empty): Gives default value for new component Libgnarl_Needed

prj.adb (Project_Empty): Gives default value for new component Libgnarl_Needed

2007-04-20  Vincent Celier  <celier@adacore.com>

	* prj.adb (Project_Empty): Gives default value for new component
	Libgnarl_Needed

	* prj-attr.ads: Minor reformatting

	* prj-env.ads, prj-env.adb (For_All_Object_Dirs): Register object
	directory using the untouched casing.
	(For_All_Source_Dirs): Idem.

	* prj-ext.ads, prj-ext.adb (Search_Directories): New table to record
	directories specified with switches -aP.
	(Add_Search_Project_Directory): New procedure
	(Initialize_Project_Path): Put the directories in table
	Search_Directories in the project search path.
	(Initialize_Project_Path): For VMS, transform into canonical form the
	project path.

From-SVN: r125442