Flow compatibility update
Created by: acrovato
Context
This PR updates the interface and test cases of flow with the latest developments. CUPyDO v1.2.3 will be compatible with waves v1.9
Changes
- Change getters to be compatible with Eigen
- Add linear (inner) solver input
- Add angle of sideslip input
Tests
Passed on gaston (debian 9.12, python 2.7.15)