FCC environment changes break heppy_batch

[vvolkl]

Newer versions of FCCSW don't define some of the environment variables that are used for heppy batch to check FCC/CMS environments. I can try to think of a more robust solution

[JavierCVilla]

In general, there is a big reliance on environment variables which also makes difficult the integration with tools such as SWAN, and hence some hacks are needed to make it run.

I think some of these variables won't be needed once heppy can be installed as a python module. For the rest of them, perhaps a good approach might be to define parameters with different options (heppy --fcc, or heppy --target=fcc), or even a configuration file.