Relative imports don't always work in jobTree

[dentearl]

Per our conversation, jobTree sometimes loses track of where imports are coming from.

Reporting file: /hive/users/dearl/alignathon/testPSAR/jobTree_flies_reg2_swarm/jobs/tmp_IqnDTgr8uv/tmp_AzbE0HYFWt/tmp_70td82ax1K/log.txt
log.txt:        Parsed arguments and set up logging
log.txt:        Traceback (most recent call last):
log.txt:          File "/cluster/home/dearl/sonTrace/jobTree/bin/jobTreeSlave", line 206, in main
log.txt:            loadStack(command).execute(job=job, stats=stats,
log.txt:          File "/cluster/home/dearl/sonTrace/jobTree/bin/jobTreeSlave", line 53, in loadStack
log.txt:            _temp = __import__(moduleName, globals(), locals(), [className], -1)
log.txt:        ImportError: No module named batchPsar
log.txt:        Exiting the slave because of a failed job on host kkr18u44.local
log.txt:        Finished running the chain of jobs on this node, we ran for a total of 5.177906 seconds

Requires explicit setting of PYTHONPATH when running on swarm, when running on kolossus simply running from the same directory as the script is sufficient.

[dentearl]

Bump.