FEATURE REQ: add 'revno' to ci output

[Jari Aalto]

It would be nice to know and record the revno right after the change.
Now the command output is:

    $ bzr-dev.my# bzr ci -m "bzrlib/builtins.py:status help listing"
    modified bzrlib/builtins.py
    $ <cursor here>

This would be more informative:

    $ bzr-dev.my# bzr ci -m "bzrlib/builtins.py:status help listing"
    revno: 1193
    modified bzrlib/builtins.py
    $ <cursor here>

Jari