[Rivet] HepMC, cmake and our bootstrap script

[Frank Siegert]

> We have another problem: when downloading FastJet using Python's
> urllib2 (as done in the bootstrap) one gets a 403 -- possibly to deny
> access to (Python) bots. Downloading the same URL with wget works
> fine. I have tried to work around this by specifying the User-Agent
> header in the urllib2 request, but I still get a 403. Hendrik, can you
> reproduce that, and would you have any other idea what to try out?

I can't reproduce this anymore today. Either the server setting has
changed or there is some kind of dynamical rejection. Anyway, let's
postpone this until it becomes a problem again.

Cheers,
Frank