move the bulk of PDBize to C++

modules/geom/pymod/export_mat4.cc

modules/geom/src/mat4.hh

modules/io/pymod/__init__.py

modules/io/tests/test_io_mmcif.py

modules/mol/alg/pymod/wrap_mol_alg.cc

modules/mol/alg/src/CMakeLists.txt

modules/mol/alg/src/pdbize.cc

modules/mol/alg/src/pdbize.hh