* Mono.Documentation/monodocs2html.cs: Fix behavior when multiple

	* Mono.Documentation/monodocs2html.cs: Fix behavior when multiple
	  source directories are provided, e.g. 'mdoc export-html -o o a b c'
	  with docs located in directories a, b, and c.  Previously this would
	  be equivalent to running aginst a, b, and c separately, resulting in
	  o/index.html being continually overwritten (and thus not showing ALL
	  available types).
	* Resources/stylesheet.xsl: Make $Index a parameter (as monodocs2html
	  will create an in-memory index containing all types from all
	  specified directories), and various changes to cope with $Index no
	  longer being a file.  Better support files in the global namespace.
	* Test/html.expected/NoNamespace.html: Fix assembly link.

svn path=/trunk/mcs/; revision=141629