Fixed problems in leo_interface reported by pylint.  The major change: changed class node to class LeoNode.
Renamed chapter and chapterController classes to Chapter and ChapterController.
Renamed chapterController to ChapterController.
added g.pep8_class_name.  defined command function that calls renamed Command class.
Changed node to LeoNode in leosax.py.  This might cause problems.
Removed changed class names from in check_class_names in @test DataTraverser
Fixed all pylint bugs in leoSTC.py, but moved several classes into the attic.
pylint-leo.py no longer enables any recent files.  That should minimize the number of commits of this file.