tidy up.
Description:
MPE option created *.clog file whenever it is executed in MPI.
The cleanup of *.clog files were done in individual Makefile.in.
Often, it is forgotten.
Solution:
Moved the cleaning of *.clog files to CHECK_CLEANFILES in commence.am
so that it is applied whenever check-clean is called.
Platforms tested:
heping pp using MPE.