[Swift-devel] updates

[Mihael Hategan]

There are some fixes in cog r2381, most notably:
- gridftp sessions were sometimes left in a messed state leading to
subsequent transfers throwing obscure errors
- coaster workers were left in an inconsistent state when jobs submitted
to them exceeded their walltimes and the remaining runtime of the
workers
- an alleged fix for "qsub not found". This tied in to our earlier
problems with finding executables. Even though, for example, java was
found using bash -l, the process wasn't subsequently started using bash
-l, leading to qsub not being in the path. The current scheme assumes
that either everything needed can be found using bash -l or everything
needed can be found without bash -l. I suppose some corner cases may
still exist, but they seem unlikely.