the original jobb's FileSetId.
kes Merge patch from Sergey Svishchev <svs@ropnet.ru> that implements
spooling in migration jobs. Not yet tested.
kes Merge patch from Jorj Bauer <jorj@seas.upenn.edu> that implements
reading conf file from a pipe. However, do it with open_bpipe()
rather than popen. Not yet tested.