Hcg changes

Hi all,

These changes cover almost all hcg requests.  Could consider moving these modified setup/ files to a new folder in the package, e.g. setup_hcg/ instead of replacing the current ones, so people can still reproduce the results in the paper exactly. 

A few changes will also be needed in doSM.py:
 - need an option to pickup -hcg inputs for all channels apart for vhtt. These files contain the extra WH and ZH templates
 - should also enable fine-binned signal morphing with these
 - the new mumu inputs have signal scaled to 1pb, so should not be ignored during scaling for the -hcg inputs.  The normal inputs should keep the current behaviour

cheers,
Andrew