Got a working version of the single sweep mode and fixed some stuff for the sweep mode.
Status byte is weird. Different modes will return a different operation complete bit, so my
hack appears to work so far.
Status byte is now debugged....for now.

I've figured out that the sweep mode will be complete when the primary status bit's = 16 or greater.
It can be greater if there's an error, in which case 17.

THe single point mode returns a status code for GET, which is 2. It will bee 3 if there's an error.
Fixed the assignment of the motors by serial number. Now, the serial connections are opened by guessing ports
0-9, if a port of connected, the sn is queried and a pair of mx,my objects ( mx = Motor(), my = Motor() )  are returned.