Switch to Python 2.4?

[Martin Pool]

After pondering this for a while and talking to people at Canonical I
think we should switch to requiring Python 2.4.  

My reasoning is this: by the time we release a 1.0, perhaps around the
end of the year, it is likely that more of the current distributions
will have 2.4.  Supporting 2.3 does take some time, both in responding
to bugs, and in writing things the longer way, and I can't justify it
when we're meant to be in a fast development mode.  I think installing
Python (possibly inside a home directory) is not too much of a burden
for people on old systems who'd like to use bzr now.

-- 
Martin