RFC: bzr --version should also announce installed plugins

[Jari Aalto]

Consider this Cygwin example:
 
    $ bzr --version

    Bazaar (bzr) 0.15.0candidate2
    Using python interpreter: /usr/bin/python2.5
    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

    Copyright 2005, 2006, 2007 Canonical Ltd.
    http://bazaar-vcs.org/

    bzr comes with ABSOLUTELY NO WARRANTY.  bzr is free software, and
    you may use, modify and redistribute it under the terms of the GNU
    General Public License version 2 or later.

it'd be nice if the lines would also indicate what plugins are
installed with the bzr. Let me suggest

    Bazaar (bzr) 0.15.0candidate2
    Using python interpreter: /usr/bin/python2.5
    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
+   plugin directory: /usr/lib/python2.5/site-packages/bzrlib/plugins
+   plugins: bzrtools 0.15.3, ... 
    ...

I believe it would be easy to iterate over directory

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

and gather the information needed for the display

Jari