(Add_Switches): reflect the changes for the switches attributes
	Default_Switches indexed by the programming language,
	Switches indexed by the file name.
	(Collect_Arguments_And_Compile): Idem.
	Reflect the attribute name changes.

	* prj-attr.adb:
	(Initialisation_Data): Change the names of some packages and
	attributes.
	(Initialize): process case insensitive associative arrays.

	* prj-attr.ads:
	(Attribute_Kind): Remove Both, add Case_Insensitive_Associative_Array.

	* prj-dect.adb:
	(Parse_Attribute_Declaration): For case insensitive associative
	 arrays, set the index string to lower case.

	* prj-env.adb:
	Reflect the changes of the project attributes.

	* prj-nmsc.adb:
	Replace Check_Naming_Scheme by Ada_Check and
	Language_Independent_Check.

	* prj-nmsc.ads:
	Replaced Check_Naming_Scheme by 2 procedures:
	Ada_Check and Language_Independent_Check.

	* prj-proc.adb:
	(Process_Declarative_Items): For case-insensitive associative
	arrays, set the index string to lower case.
	(Recursive_Check): Call Prj.Nmsc.Ada_Check, instead of
	Prj.Nmsc.Check_Naming_Scheme.

	* prj-tree.adb:
	(Case_Insensitive): New function
	(Set_Case_Insensitive): New procedure

	* prj-tree.ads:
	(Case_Insensitive): New function
	(Set_Case_Insensitive): New procedure
	(Project_Node_Record): New flag Case_Insensitive.

	* prj-util.adb:
	(Value_Of): new function to get the string value of a single
	string variable or attribute.

	* prj-util.ads:
	(Value_Of): new function to get the string value of a single
	string variable or attribute.

	* prj.adb:
	(Ada_Default_Spec_Suffix): New function
	(Ada_Default_Impl_Suffix): New function
	Change definitions of several constants to reflect
	new components of record types.

	* prj.ads:
	(Naming_Data): Change several components to reflect new
	elements of naming schemes.
	(Project_Data): New flags Sources_Present and
	Language_Independent_Checked.
	(Ada_Default_Spec_Suffix): New function.
	(Ada_Default_Impl_Suffix): New function.

	* snames.ads:
	Modification of predefined names for project manager: added
	Implementation, Specification_Exceptions, Implementation_Exceptions,
	Specification_Suffix, Implementation_Suffix, Separate_Suffix,
	Default_Switches, _Languages, Builder, Cross_Reference,
	Finder. Removed Body_Part, Specification_Append, Body_Append,
	Separate_Append, Gnatmake, Gnatxref, Gnatfind, Gnatbind,
	Gnatlink.

	* prj.ads: (Ada_Default_Spec_Suffix, Ada_Default_Impl_Suffix):
	Add comments.

	* prj-nmsc.adb (Ada_Check): Test that Separate_Suffix is defaulted,
	not that it is Nil_Variable_Value.

	* prj.ads: Add ??? for uncommented declarations

From-SVN: r46169