Moved RECV_PIN to A0 to enable IR receiver component to be plugged directly into the board without any cabling. Such win. Less is more.
Moved RECV_PIN to A0 to enable IR receiver component to be plugged directly into the board without any cabling. Such win. Less is more.

Also changed PEN_UP/PEN_DOWN to reasonable values for the plotter3 design.

snebragd/stringent,snebragd/stringent,snebragd/stringent,snebragd/stringent