Added ChGlyphs as a visualization asset that can be used to show points or vectors (or other stuff like coordinates or tensors, in future).
Those symbols are frequently used for FEM postprocessing, ex. they are used in the unit_FEM thank to the ChVisualizationFEMmesh converter.
The way those glyps (simple simbols) are drawn depend on the rendering subsystem: currently only the IRRLICHT unit supports glyphs rendering. The POVray support will be done later.
Refactoring. The old ChLcpKstiffness and ChLcpKstiffnessGeneric classes have been renamed to ChLcpKblock and ChLcpKblockGeneric.
This because in the LCP / CCP/ VI, those objects can be used to define a matrix sparse block that is not necessarily a stiffness matrix (it is a stiffness matrix in the case of linear elastic problems, but in more general sense it is just a block in the KKT matrix).
Improvements to the FEM code.
Experimental support for Poisson3D problems and diffusion problems, ex. the thermal and electrostatic problem.
Experimental support of Euler-Bernoulli beams.
Work in progress.