The repo location reported by `svn` is a URL. If you don't decode it before using it a prompt, the `%` sequences will be misinterpreted by prompt expansion and give screwy results.
Fixes#2233
Refactor the functions and group listings to have fewer functions,
but have them take group names as parameters.
Pull group definitions in to a single associative array.
Change error output to more conventional OMZ format, so it's clear the plugin is for oh-my-zsh and not base zsh.
Use `local` variables instead of manual unsetting.
Andrew Janke