[Ada] Reformattings

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on HEAD

Update rules about Preelaborate/Pure pragmas: these pragmas
are always indented one extra level, and never take the optional
entity parameter, except for a standalone library-level subprogram spec.

Patch long and boring compressed, since too big for an attachment on this
list.

2005-09-01  Arnaud Charlet  <charlet@adacore.com>

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	s-poosiz.ads, s-powtab.ads, s-purexc.ads, s-sopco3.ads, s-sopco4.ads, 
	s-sopco5.ads: Minor reformatting: reindent pragma Pure/Preelaborate
	and always use the no parameter form for consistency.

	* gnat-style.texi: Document rules about Preelaborate/Pure pragmas.

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