[MERGE] More than double the speed of "bzr selftest"

[Andrew Bennetts]

John Arbash Meinel wrote:
> Martin Pool wrote:
[...]
> > 
> > Thanks for catching that; I should have realized seeing as I did add
> > the exit hack myself.  Is it ok with you if I use Andrew's approach of
> > explicitly running  those hooks before we exit (assuming that works)?
> 
> - From reading the docstring it looks like it will. I'm not sure if this will
> effect running time for commands.

I'd be interested in measurements, but my guess is not much.  Most of the time
we save by avoiding interpreter tear down is garbage collection and memory
deallocation I think.

-Andrew.