Update prediff-for-aprun-with-moab to filter more generally.

Removes absolute filepath and line number from grep filter. This came about when we moved testing from one system to another.
Merge pull request #96 from thomasvandoren/update-aprun-prediff

Update prediff-for-aprun-with-moab to filter more generally.

Removes absolute filepath and line number from grep filter. This came about when we moved testing from one system to another.

r: @hildeth