standardize include guards

modules/mol/mm/src/block_modifiers.hh

modules/mol/mm/src/buildingblock.hh

modules/mol/mm/src/ff_reader.hh

modules/mol/mm/src/forcefield.hh

modules/mol/mm/src/gromacs_block_modifiers.hh

modules/mol/mm/src/heuristic_block_modifiers.hh

modules/mol/mm/src/modeller.hh

modules/mol/mm/src/simulation.hh

modules/mol/mm/src/state_extractor.hh

modules/mol/mm/src/steep.hh

modules/mol/mm/src/system_creator.hh

modules/mol/mm/src/topology_creator.hh