Merge branch 'develop'

doc/index.rst

meld/CMakeLists.txt

meld/data/CMakeLists.txt

meld/data/Makefile

meld/data/pdb-reference.dat

meld/doc/CMakeLists.txt

meld/doc/index.rst

meld/doc/loop.rst

meld/doc/rawmodel.rst

meld/pymod/CMakeLists.txt

meld/pymod/Makefile

meld/pymod/__init__.py

meld/pymod/export_gap.cc

meld/pymod/export_model.cc

meld/pymod/export_model_annot.cc

meld/pymod/mtm.py

meld/pymod/qa.py

meld/pymod/wrap_meld.cc

meld/src/CMakeLists.txt

meld/src/Makefile