[Clas12_software] more event generators

[Nathan Baltzell]

FYI All,

Some folks have expressed interest in GiBUU and GENIE event generators, and they're available for testing and use at JLab.  Not yet available in our default environment but easily accessible like so:

module load clas12
module switch -f mcgen/2.34c

And then you can run them for clas12 if you know how (I don't):

genie ...
GiBUU.x ...

We'll need more info on their usages, examples, configuration files, etc, for clas12 physics, to see how best to support the necessary options from the OSG portal.

-Nathan