Python 3 support

Rosen Matevrequested to merge
rmatev-python-3 into master

Support Python 3 while keeping Python 2 compatibility. The list of changes/commits (can be reviewed independently):

  • Run futurize stage 1
  • Replace execfile with importOptions
  • Run futurize stage 2 (tweaked)
  • Use inspect.signature for Python 3
  • Replace math.log with just log in functors
  • String/bytes compatibility with Python 3
  • Flush printout of ApplicationOptions object
  • Python 3 requires __hash__ when __eq__ is overridden
  • Do not mutate MC checking categories
  • Remove extraneous print statements
  • Use None instead of empty string to signify default
  • Remove unnecessarily high timeout from tests
  • Python 3 compatibility for reading opts and pkl options

See LHCBPS-1858 Must be applied together with LHCb!2694 (merged)

Edited by Rosen Matev

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