[Rivet] RivetGun news: dynamic rivetgun reinstated, run params from file...

[Lars Sonnenschein]

> How does GENSER handle the different versions of the C++ generators,
> where the generator subcomponents themselves are dynamically loaded
> libraries?

Herwig++ has only one version. 

Pythia8 has like fortran Pythia
different directories with complete installations.

Sherpa has two versions. Both are in completely separated subdirectories
with their respectively own complete sets of shared libraries. 

	Lars