Integration of custom VTK edition

Adds solve, post function skeletons for processes and calling them from main.

Create dof map

Update RunTime and CPUTime for mpi support.

This reverts commit fbce1974d9830517da8138c0a42b35ceab126843.

This is an intermediate implementation until there is the final cell
data implementation in MeshLib.

I had to introduce a const reference value access method to Element.