added compare_to wrapper method, remove object/string_methods _set_Sets_and_type now reset supporting_set
added compare_to wrapper method, remove object/string_methods _set_Sets_and_type now reset supporting_set

Ensembl/ensembl-funcgen,Ensembl/ensembl-funcgen,Ensembl/ensembl-funcgen,Ensembl/ensembl-funcgen