Adding higher number of LHE files for the SS via sleptons grid. [skip modfiles]
Description of bug
Jobs were failing due to inadequate number of LHE files per job, and had insufficient total number of LHE files for mc16a/d/e campaigns.
The number of files per job was re-calculated taking into account both before Pythia showering efficiency and generator filter efficiency. The number of files now is sufficient for mc16a/d/e campaigns due to additional statistics produced for squark pair production LHE files.
A great number of JO were tested locally.