sem_ch13.adb (Analyze_Attribute_Definition_Clause, [...]): enhance, document & limit detection of non-sharable internal pools.

2004-10-26  Cyrille Comar  <comar@act-europe.fr>

	* sem_ch13.adb (Analyze_Attribute_Definition_Clause, case
	'Storage_Pool): enhance, document & limit detection of non-sharable
	internal pools.

	* impunit.adb: Make System.Pool_Global and System.Pool_Local visible.

	* s-pooglo.ads: Add more documentation now that this pool is properly
	documented.

From-SVN: r89669