Overhaul of circular arc test G code
Compatibility changes for 3dchips
Fixes for python auto test to allow user finer control
Moved long nc files to subfolder
Removed spindle movement from quick tests to debug python
test-all.sh seems to be working properly now
tangent helix test shows tangent and non-tangent case
Merge branch 'feature/python-test-fixes' into circular-blend-arc-experimental