[Ifeffit] Atoms restraints

[Massimiliano Stola]

Thank you for all the explanations about constraints for the histidine ring 
within Artemis.

Well, I think that it will be easier, but boring, building several reasonable 
structures and test them one by one... I think I'll finally follow this way.

I'll be interested as well in the possibility to simulate exafs data for 
several structures at once, like Stefano asked. It would be a nice feature 
for the next releases of the program!

Regards
Max