Where:
- imol1 is an integer number
- imol2 is an integer number
- mmdb_atom_sel_str_1 is a string
- mmdb_atom_sel_str_2 is a string
- move_imol2_copy_flag is an integer number
detailed interface to superposition.
Superpose the given atom selection (specified by the mmdb atom selection strings) of imol2 onto imol1. imol1 is reference, we can either move imol2 or copy it to generate a new molecule depending on the vaule of move_imol2_flag (1 for move 0 for copy).
Returns: the index of the superposed molecule - which could either be a new molecule (if move_imol2_flag was 1) or the imol2 or -1 (signifying failure to do the SMM superposition).