[Swift-devel] runaway jobs

[Mihael Hategan]

I committed a bunch of stuff to deal with that. The idea is to kill a
job if it's over 2*walltime and allow swift to re-schedule it.

It required some changes to the cog abstraction interfaces, and I used
the opportunity to do some clean ups. This means odds of something
breaking somewhat higher than normal. I also updated the versions of
most of the providers, so jar file names will change.