LCM: initial commit for an anisotropic viscoplasticity model
LCM: work on Arrhenius temperature dependence...

in preparation for the viscoplastic model.
LCM: work on temperature support in material point simulator
LCM: further work on generalization of the material point simulator

Added a test for the general prescription of a deformation gradient.

Changed the tests for a slightly new syntax.

The introduction of temperature is work in progress and is not functional yet.