* Add a trap handler to try and clean up the build if it is interrupted
by a signal (one problem with the previous version is that package builds
whice are interrupted by ptimeout because they are stuck, leave their
working files lying around in the chroot).
* Switch to NFS v3 mounts instead of v2
* Autogenerate the version string to report in uname within the chroot,
based on the version string in the head of the CVS branch being built.
* Copy packages via cp from the NFS mount, not scp.
ba656274f6