tinderbox status update

Hey, hey-

After some playing around, tinderbox now updates directly to ONGOING
and as always the last completed build is in LATEST. I'm not sure
these names convey quite what they are meant to, though- I'm open to
suggestions.

It also now sends email to this list at failure time, and only on
modules which fail because of their own problems- if a dependency
fails to build, no mail should be generated.

I've actually slightly reduced the stuff I do now to get this to work,
but that doesn't mean I don't feel slightly dirty about what I've done
to jhbuild. Hopefully I can figure out a better, more extensible
mechanism to do what I need for future changes (of which more may come
this weekend or monday.)

Some other things on my TODO:

* have a top-level index page closer to
http://tinderbox.mozilla.org/showbuilds.cgi?tree=Aviary-1.0- not sure
if the base unit should be modules or 'complete' builds.

* figure out which modules are gnome and which are not, so that we can
send more useful error messages including CVS links about gnome
modules.

* get my setup into GNOME cvs so others can hack/contribute/whathaveyou.

Other suggestions/questions/whathaveyous are welcome.
Luis