Terminology fixup: we say "(re-)convert" instead of "rewrite" now.
Update test/CMakeLists.txt
Enable '-' characters in repository names

This will allow us to create explicit rules that generate the svn2git-fallback repo
Adjust patrie so that it starts with a node matching the empty string
rather than a list of nodes.

Much of this change might be less awkward if all paths in the patrie
were normalized to have a leading slash but no trailing slash.
Better reporting of unrecognized responses from git fast-import's "ls" command
Add a fallback repo to the test ruleset so we don't assert
Completely rework testing CMake stuff