Adds sphinx-argparse to requirements.txt

This is now needed to build the documentation.
Added back logging.handlers

core/debug.py:
  It was removed by 30c7410b but is needed on non-windows.
  Buildbot only issued a warning.
Added parameterExploration config option back
Fixes formatting of critical message in core.debug
Fixes use of debug.critical()
Adds missing +x on scripts
Fixes typo: parameterExploration is a flag
Adds unexpected_exception() for core notifications