[phenixbb] Ramachandran and clashes

[Pavel Afonine]

> We never had rotamer restraints (although I guess the new RSR method
> uses them internally), just the fix_rotamers option, but that is now
> merged with the RSR code.

Rotamer restraints are now used routinely if real-space refinement is 
enabled (there are lots of "if" before they get enabled). Similar but 
not exactly the same for Cbeta restraints.

Pavel