Name changes in transformation submodule to align with the current design
The changes are as follows:
- Renamed
TransformationOperatorABC
toOperatorABC
- Renamed
MatrixTransformationOperator
toMatrixOperator
- Renamed
BarycentricOperatorABC
toBarycentricOperator
- Removed
generating_points
from the list of arguments forTransformationABC
- Add references from math intro to api docs
- Fixes several warnings in docs