[RFC] Ask for confirmation if the commit message is a file name, v2

[Gioele Barabucci]

Thank you for all the responses and suggestions, here is the second version 
of the patch:

Changes:
  * abort => cancel
  * check whether we are running non-interactively
  * return 1

Questions:
  * With BzrCommandError I get "bzr: ERROR: Commit cancelled". This is not 
exactly an "error", the user cancelled the commit herself. What else should 
I use? Should I create a new exception?
  * Could you suggest me how to test this? I had a look around the other 
tests and none care to check whether a get_boolean is issued. All I found 
was the use of CannedUIResponse to test get_boolean itself but I don't know 
how to combine that with bzr_run.

I hope you don't mind me sending these patches to the mailing list. 
Launchpad is OK for seasoned contributors, but I feel more comfortable using 
this more "human" media.

-- 
Gioele Barabucci <gioele at svario.it>
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