Item12819: Pass Interwiki links through expandCommonVariables

Macros are not expanded within a interwiki link definition.

The case here is specific to Foswiki.org. We need to map svn rev's to git hash references. A new macro plugin / macro is created that will map rev to ref.

distro:38a5a7f35c6c returns df46972 which could be used in a github url.

However the interwiki definition:

Foswikiref

https://github.com/foswiki/foswiki/commit/Invalid svn rev

revision $page of 'Foswiki'

fails to expand the macro in the rendered link.

Simple solution is to call expandCommonVariables on the link generated by InterwikiPlugin.

-- GeorgeClark - 23 Mar 2014

This fix is still needed, but unfortunately it's not enough to support the migration to Github. Since a single SVN rev can expand into multiple git commits, we need to override the returned url format.

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