Merge branch 'sdf_v3000' into develop

modules/io/src/mol/sdf_reader.cc

modules/io/src/mol/sdf_reader.hh

modules/io/tests/CMakeLists.txt

modules/io/tests/test_io_sdf.py

modules/io/tests/test_io_sdf_v3000.cc

modules/io/tests/testfiles/sdf/m_chg.sdf

modules/io/tests/testfiles/sdf_v3000/compound.sdf

modules/io/tests/testfiles/sdf_v3000/multiple.sdf

modules/io/tests/testfiles/sdf_v3000/properties.sdf

modules/io/tests/testfiles/sdf_v3000/simple.sdf

modules/io/tests/testfiles/sdf_v3000/test.py

modules/io/tests/testfiles/sdf_v3000/wrong_atomcount.sdf

...les/io/tests/testfiles/sdf_v3000/wrong_atomlinelength.sdf

...les/io/tests/testfiles/sdf_v3000/wrong_bondatomnumber.sdf

modules/io/tests/testfiles/sdf_v3000/wrong_bondcount.sdf

...les/io/tests/testfiles/sdf_v3000/wrong_bondlinelength.sdf

modules/io/tests/testfiles/sdf_v3000/wrong_bondtype.sdf

modules/io/tests/testfiles/sdf_v3000/wrong_charge.sdf

modules/io/tests/testfiles/sdf_v3000/wrong_keyword.sdf