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.  
In Windows, both "\" and "/" are not allowed in file names. I don't know about Linux/Mac but I doubt that you can use them anywhere... 
BTW: In ```BaseLib/FileTools.h``` are a number of functions for handling paths and file names, e.g. getting a path without file name, getting a file name without path, getting the base name (file name without extension), getting the extension, checking if a string contains a path or a file name only, etc.