- In hpss.py, import CrawlConfig and put a CrawlConfig.log() where
  hpssTest.py will fail if CrawlConfig is not imported.
- In crawlTest.py, whine and die if a .cfg file does not exist.
- In hpssTest.py, manage the log file so test logs go into the test
  directory but we don't wind up with the test directory being
  undeletable. Also, remove all the unnecessary 'except
  AssertionError' stanzas.
- crawl.cfg.sample: added xlim_* parameters
- crawl.py: enhanced exception handling -- bail out on 1) too many
  exceptions in a limited time, 2) too many repetitions of the same
  exception, or 3) too many total exceptions. Also made the limits on
  these all configurable
- crawlTest.py: reset logger before attempting to clean up test dir,
  reorder tests to match run order.
Merge branch 'devel'