Fix dsid gpadovan 525999

Description of bug

1. The requester had a wrong flavour scheme in the controller file.
2. The names of all the mc.MG* where not descriptive enough

Changes introduced

1. 1 line changed in madGraphController_vlqvll2hdm.py
2. The names of all the mc.MG* where changed to mc.MCPy8*

Tests

Issues resolved

Closes #