versioncontrol: Handle relative repository paths in `trac-admin`, and enforce absolute paths in the "Repositories" admin panel.
versioncontrol: Handle relative repository paths in `trac-admin`, and enforce absolute paths in the "Repositories" admin panel.

Closes #9345.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@9704 af82e41b-90c4-0310-8c96-b1721e28e2e2

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