Bundling more plugins into bzrtools

[Martin Pool]

I'd like to go one further and say that I'm open to merging some
plugins into Bazaar core.  Not everyone is going to discover the
feature they'd really love if it's even in bzrtools, let alone another
plugin.

In most of the ones we've looked at the main problem seems to be that
they have no tests, and we generally require them for things in the
core.  But we can reasonably relax that, I think, to things that have
at least command-line smoke tests.

-- 
Martin