Added some comments to the ToolPath class header file by way of explanation as to how it fits into the overall scheme.

Started playing with the PostProcessor class but very early days.
Merge branch 'nightly' of https://github.com/DavidNicholls/FreeCAD_sf_master into nightly

Conflicts:
	src/Mod/Cam2/App/PostProcessor.cpp
Added various Python scripts to the PyPostProcessor/PostProcessor directory.

Got the basic Python interpretation to work without implicitly adding space or newline characters to the GCode data.

This is the first version where a very rough ToolPath set of instructions actually produces some readable GCode.