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.  
For readASCII, it is OK to be any type of integer. For readBinary, these data of all ranks are saved in a long array for reading. Since this array is only used locally inside the function, I would like to keep the current sytle.