New features and bugfixes in the (still experimental) FEM code:
- new ChElementBar class, that is like the ChElementSpring, but with element mass (it can work with zero mass ChNodeFEMxyz nodes),
- new API funcitonalities to support dynamics in FEMs, at least within the 1st order implicit Euler solver as in default timestepping of Chrono, see..
- new demo_FEMdynamics
Merge branch 'master' of https://github.com/projectchrono/chrono