[Rivet] rivet installation

[Andy Buckley]

Altan Cakir wrote:
> Hi James again,
> 
> I think that i solved the problem ! The problem is Sherpa version of
> 1.1.2 part. When i changed the version 1.1.2 to 1.1.1 in the script for
> sherpa path it is working ! I think that you should check the new sherpa
> version in order to match with the script.

Actually, the head version of AGILe should *only* be able to work
properly with Sherpa 1.1.2

I've done some hacking of the AGILe build system today and it now works
on CERN lxplus for all our supported generators. A good time to give the
"developer mode" rivet-bootstrap script another go, I think!

Andy