- Fix problem with bionlp2013-PC data.

  EventDetector won't delete a temporary file, for debugging sake.
  Refactoring combine.
  BANNER is now usable.
Little refactoring around, extracting defaultconfig which maybe use later
Little typo in eventdetector.py
- Refactor the import of detector to use __import__.
- Change default connection # in unix connection 4.
- EdgeExampleBuilder's isPotential???? has return false instead of
  assert false
- Delete some legacy comment stuff
- Fix wrong member in compare.py
- Clear BANNER before some change
- Clean more
- Change some assertion in writeXML of SentenceExampleWriter so that
  I'll skip if there is no example
- Fix len(examples) to len(list(examples)) since it is a iterable.
- Include log but still do nothing
- Add task setting MET
- Most task setting is now separate in another file
- More refactoring
- Trying some logger in STTool and pick out assertion
- Revert "- Trying some logger in STTool and pick out assertion"
- 30b3aea commits introduce weird "IOError: String named
  'trigger-threshold' not defined in model model-devel" error

This reverts commit 30b3aeaab011e30dcdc3c1151062697861ddcae1.