Test comments indicated that having rkwl_wdc_op set to > 1 means
no test, but there was conditional that was just checking
that the value was not 0 and thereby causing those opcodes
to be tests when this value was set to > 1
self modifying immediate opcodes now execute in data RAM. the remaining
self modifying branch range test is supplemented by an early pretest to
check for correct relative addressing.
