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.

pkdevbox/trac,pkdevbox/trac,pkdevbox/trac,pkdevbox/trac