proposal for exporter
process OpenSCADs stdout and allow os.unlink to fail
OpenSCAD check for gui in rotate extrude
added function to search for the openscad executeable

this function implmented but not called at the moment
use TypeId instead of Type of Part::Feature in exportCSG.py
search for OpenSCAD executable when initalizing WB
OpenSCAD check for relative paths in open function as well
Merge remote-tracking branch 'refs/remotes/shoogen-github/dev-openscad'
OpenSCAD: call which to find openscad executable

on all platforms except 'win32'
Merge branch 'refs/heads/dev-openscad'