This is similar to what I did for the source:branches/cboos-dev/db-refactoring
so there will be some opportunity for code sharing.
Now there is support for creating a Trac environment without specifying a repository
(see #156).
Also, by specifying the prefix 'direct-svn-fs', one can use the Subversion backend
without the cache, which can be useful for development or if you're annoyed by the
'resync' command...