ENH: Python Bindings for Generic Linear Elastic Material + doc
Summary:
MAINT: closes T2517
WIP: added MaterialLinearElasticGeneric2 with eigenstrains, no tests yet
MAINT: lint
ENH: added MaterialLinearElasticGeneric2
closes T2519
Test Plan: Jenkins tests pass
Reviewers: hu
Maniphest Tasks: T2519, T2517
Differential Revision: https://c4science.ch/D231