WIP: making madspin run for SUSY signals

Hi,

• I have added an instance that copies the MadSpin card, if there is anyone defined, into the gridlock as done for param_card.dat and run_card.dat
• Instead of changing the name of the param_card, preserve the input param_card
• If there is a parameter that is not substituted in the param_Card because it is not found there, don't crash the code but just print a warning. Useful in the case that one tries to generate a signal that doesn't use the same param_Card than the MSSM_SLHA2 model.

Any feedback on these changes is welcome!

Best,

Alvaro