Added DFR_DPHWeight to weight.h and corrected indentation in the PL2 class.
Added DFR_DPHWeight to the registry.
dfr_dphweight.cc contains implementation of DFR_DPHWeight.
Added dfr_dphweight.cc to the Makefile.
Added DFR_DPHWeight to the csharp makefile.
Added DFR_DPHWeight to the java bindings makefile.
Simple test for DFR_DPHWeight.
Feature tests for the dph weighting scheme.