backport.pl redesign: An API

[Daniel Shahaf <d....@daniel.shahaf.name>]

It has been anonymously hinted to me by Bert and Brane that I should
really think about rewriting backport.pl in a language other than Perl.

Right now, backport.pl can do four things: the nightly mergebot; the
hourly conflicts detector bot; and the two interactive functions from my
earlier email today.  However, it's written in Perl, and the internals
aren't that pretty to read even if for people comfortable with Perl.

So, assuming backport.pl had been rewritten in Python, what kind of API
would it have?  The STATUS parsing would be encapsulated by some
class; what methods would it expose?