- Added the Residue-Protein Proximity restraint. This restraint is de…

[iecheverria]

…signed to restraint the distance between a residue or fragment and a proteins. Can be used, for example, to model mutagenesis data that indicates which protein regions are implicated in protein-protein interactions.

• The PMI wrapper residue_proximity_restraint.py allows to add the restraint to standard protein selections.

• The example residue_proximity_restraint.py shows a two protein system.

[benmwebb]

Manually merged in as of ddcd85e6a7aa045b44c272ab25ef2c76305e6128