Added implementation of Robert Best's HPS model

arbdmodel/__init__.py

arbdmodel/hps_polymer_model.py

arbdmodel/resources/two_bead_model/BBP.dat

arbdmodel/resources/two_bead_model/BPB.dat

arbdmodel/resources/two_bead_model/BPP.dat

arbdmodel/resources/two_bead_model/NBBB.dat

arbdmodel/resources/two_bead_model/NBPB.dat

arbdmodel/resources/two_bead_model/NBPP.dat

arbdmodel/resources/two_bead_model/b1p1p2b2.dat

arbdmodel/resources/two_bead_model/b1p2b2.dat

arbdmodel/resources/two_bead_model/b1p2p3.dat

arbdmodel/resources/two_bead_model/b1p2p3b3.dat

...esources/two_bead_model/diffusion/b-bead.hydropro-pri.bea

...sources/two_bead_model/diffusion/b-bead.hydropro-pri.vrml

...esources/two_bead_model/diffusion/b-bead.hydropro-res.txt

...esources/two_bead_model/diffusion/b-bead.hydropro-sol.txt

arbdmodel/resources/two_bead_model/diffusion/b-bead.pdb

arbdmodel/resources/two_bead_model/diffusion/b.hydropro.dat

...model/resources/two_bead_model/diffusion/hydropro-fit.txt

...model/resources/two_bead_model/diffusion/hydropro-sum.txt