bzr --version should also report plugin versions (bzrlib ...)

[Jari Aalto]

I would have a small wish to next bzr version:

    $ bzr --version

    Bazaar (bzr) 0.18.0
      from bzr checkout /usr/lib/python2.5/site-packages/bzrlib
        revision: 2
        revid: jari.aalto AT cante.net-20070401090549-bigooycypl8hej66
        branch nick: bzrlib
    Using Python interpreter: /usr/bin/python
    Using Python standard library: /usr/lib/python2.5
    Using bzrlib: /usr/lib/python2.5/site-packages/bzrlib
    Using Bazaar configuration: /cygdrive/x/home/jaalto/.bazaar
    Using Bazaar log file: /cygdrive/x/home/jaalto/.bzr.log

It would be nice if the plugin version numbers were also reported:

    Using bzrlib: /usr/lib/python2.5/site-packages/bzrlib 0.18.0

It's a little difficult to grep under

    /usr/lib/python2.5/site-packages/bzrlib

and decode where the version infomation might be.

Jari