pywer: Remove debugging stuff
pywer: Don't print out warnings if we're quiet
zsh: Add zsh completion

Mostly just stolen from cower, a few options missing are removed, some
added, etc.
Add _pywer to the sdist tarball
pywer: Use defaults for args.force
pywer: exception if no target for {m,}search, info
pywer: Remove versioned configs

Our config should no longer be changing. This commit marks the start of
a stable config format.