Use of patch files

[Cvico]

As of today GridpackMachine does not copy .patch files into the input_files. This means that
we can't use process-specific patches (e.g. instead of using cuts.f, we could just patch the lines
that are relevant to implement whatever cut we need).

The solution could be simply to also copy the .patch files. This can be done in:
https://github.com/cms-PdmV/GridpackMachine/blob/12dda4a9571d23d14c0b1fd298482b31ee3fe1e6/madgraph_gridpack.py#L9-L18