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.  
Some times for some cluster  with  narrow bandwidth and for large data set,  ``int`` may work. Anyway, technology is improving dramatically and we have no chance to run computation in an old machine. Removed ``MyInt``.