[Rivet] Charybdis and AlpGen / RivetGun interface change / FHerwig hwaend_ problem

[Andy Buckley]

Hi,

I've changed the implementations of the Charybdis and AlpGen wrappers to
inherit from their respective FHerwig and FPythia wrappers, which simplifies
things a lot, and I've converted all generator wrappers to only use the
string-based setParam method (the others will happen automatically). Please
test them a bit, since there may be bugs with the parameter passing.

Also, I've added the Charybdis and AlpGen generators to the rivetgun list of
generators to be dynamically loaded, but since I don't have either installed on
my system I don't know if they work. Chances are they don't, because the wrong
library is trying to load. If you are working with these generators, can you
take a look in RivetGun's src/LoaderDlopen.cc file and try to fix any problems
that you encounter?

Lastly, I've got FHerwig and FHerwigJimmy split now, and both are available
from the command line. However, I see that both versions complain about a
missing "hwaend_" symbol: is this one that we've forgotten to declare, or a
manifestation of the user process removal from the CEDAR fherwig/fpythia
generator bundles?

Andy

-- 
Andy Buckley: CEDAR @ IPPP, Durham
Work: www.cedar.ac.uk
www.insectnation.org