Add more python tutorials
Add more Python tutorials to the demos/api directory.
- t7.py
- t8.py
- t9.py
- t11.py
- t15.py
- t17.py
Also add a new API function: gmsh::model::mesh::field::fromView
.
I had trouble setting up background fields in t7 and t17, because properly making a field from a view is somewhat tricky (you have to know what options to set, etc.)
This function takes care of setting up a new field from a given view tag, so the user doesn't have to worry about the right setup steps and can set that field as a background mesh right away.