Use RFC:2396 style scheme also for InterWiki prefixes.
Use RFC:2396 style scheme also for InterWiki prefixes.

Should fix trac-ticket:... and trac-changeset:... issues seen
on Trac hacks reported by athomas.

Also improved a bit the output of the ![[InterWiki]] macro
and did some refactoring for the expansion of link arguments.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@2859 af82e41b-90c4-0310-8c96-b1721e28e2e2

jun66j5/trac-ja,netjunki/trac-Pygit2,walty8/trac,jun66j5/trac-ja,netjunki/trac-Pygit2,walty8/trac,netjunki/trac-Pygit2,walty8/trac,jun66j5/trac-ja,jun66j5/trac-ja,walty8/trac