[merge] show version while testing

[Ian Clatworthy]

Ian Clatworthy has voted +1 (conditional).
Status is now: Conditionally approved
Comment:
I guess that was me, so thanks for this. I agree with John though: 
show_copyright needs to have a default value of True so 'bzr version' 
functions as before. (The copyright is never shown otherwise.) Leaving 
the copyright out when calling from selftest is the right thing.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3Ce01316480707120321x2f05feb3h96ae7e67d43b0cf0%40mail.gmail.com%3E