Now, the trac.ini has to be setup like this:
{{{
[trac]
repository_type = hg
repository_dir = /usr/local/hg/repos
}}}
By default the `repository_type` is "svn", so nothing will change
for SVN users.
Also, did a few renamings:
* s/IScmBackend/IRepositoryConnector/
* s/ScmBackendManager/RepositoryManager/