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.  
isn't the following
```
if (_rank==0)
{
}
if(i > 0) {
    if (_rank==i)
}
```
equal  to
```
if (_rank==0)
{
} else if (i>0) {
}
```
?