gmoccapy_1_3_5_1 - updated to current version

A lot of changes , please see release_notes.txt for all details

hal_gremlin.py has been changed to send a signal if bad gcode is found.
and gmoccapy does not react to that signal.

Signed-off-by: Norbert Schechner <nieson@web.de>
Merge pull request #404 from gmoccapy/master

gmoccapy_1_3_5_1 - updated to current version