project settings

[peterhor]

In the project_setup.py we need to adjust/add settings for:

• [x] snapping options - snapping to the vertices
• [x] avoid overlap within the NiN polygon layer

[9ls1]

I think I have managed to add the proper code for this in the project_setup.py. However, I'm pretty sure @lasseke will adjust the code so it fits in to the "design" of the rest of the py-files.

[peterhor]

solved in #30