CTEST: Fix MUMPS file parser and update test

The current file parser for a MUMPS routine uses a period "." as the
one of the signals that a line of MUMPS code is executable.  This is not
a correct assumption.  Add the period to the list of characters that CTest
will not consider the start of a line of code.

Update the test routine to have an entry point with code to match the scenario
mentioned above.
Merge topic 'fix_mumps_file_parser' into next

6d66e396 CTEST: Fix MUMPS file parser and update test