Convert from tinderbox to buildbot

[olly]

Tinderbox isn't cleanly configurable in the way we want, so I've had to hack it around a lot. Buildbot looks a much better bet, as it's designed to allow modification by subclassing.

[olly]

I can't see myself finding time to work on this in the forseeable future...

[richard]

I've set up a buildbot on atreus. It's currently only testing unix - I've got a windows MSVC build half configured, but it's proving very hard to get it working.

The web interface is not currently publically visible, but the IRC bot is sitting in #xapian-devel on irc.freenode.net.

[richard]

The buildbot now performs builds of tarballs (whenever new ones appear) as well as builds tracking SVN. I plan to add the following in the near future (ie, within the next few weeks), not necessarily in this order:

1) Add windows builds from tarballs. I think the easiest way to do this will be to write a script to live on the windows machine which manages the whole build - bypassing much on buildbot's machinery which seems to get in the way. 2) Implement build-over-ssh, with the client running on atreus, but transferring files to a remove machine and running the build commands using ssh. 3) Add builds with --enable-debug and --enable-log (and both).