Class for parallel reading of partitioned mesh data

Along with commit 4cda158,  member function ``stop()`` of class CPUTime and RunTime were removed, and the calling of the function has been removed in the related files.  
Nori is right. A lot of algorithms in MeshLib depend on the node ids to be set correctly and I would strongly advise against adding this flag.
If you need to keep other IDs temporarily I would would suggest keeping an additional unsigned vector to use as a map.