.ROI_plugin_canonicalize_solution(solution, optimum, status, solver, message = NULL, ...)
"OP_solution"
.
.ROI_plugin_add_status_code_to_db
,
.ROI_plugin_get_solver_name
,
.ROI_plugin_make_signature
,
.ROI_plugin_register_solver_control
,
.ROI_plugin_register_solver_method