Include competition ID in WPRS results file

[Joerg Ewald]

Right now the WPRS results file that is submitted to the CIVL competition coordinator carries a generic name, e.g. "WPRS_comp_result_(20141225-2003).txt"

For the CIVL competition coordinator, this can cause some problems or confusion because there is no indicator in the name nor inside the file that tells which competition a file is for.

So the name should include the competition ID, and possibly also the competition name.