Function SCIPsetWriteParams 

pub unsafe extern "C" fn SCIPsetWriteParams(
    set: *mut SCIP_SET,
    messagehdlr: *mut SCIP_MESSAGEHDLR,
    filename: *const c_char,
    comments: c_uint,
    onlychanged: c_uint,
) -> SCIP_RETCODE

writes all parameters in the parameter set to a file