[torquedev] BLCR checkpoint and restart checked into trunk

[Steve Snelgrove]

I checked in the BCLR checkpoint and restart changes into the trunk (2.3)
and made a snapshot release.  There might still be a few small problems
with this code but it does at least seem to work.

I have done a documentation page for anyone who is interested in this
feature.

  http://www.clusterresources.com/torquedocs21/2.6jobcheckpoint.shtml