Minor changes to board.

* Change refs of components to all match Px
* Add solder jumpers to avoid populating the DIP switch.
* General board track optimization.

electronics/LogicBoxen-cache.lib

@@ -276,6 +276,22 @@ X GND 1 0 0 0 D 50 50 1 1 W N
 ENDDRAW
 ENDDEF
 #
+# JUMPER
+#
+DEF JUMPER JP 0 30 Y N 1 F N
+F0 "JP" 0 150 50 H V C CNN
+F1 "JUMPER" 0 -80 50 H V C CNN
+F2 "" 0 0 60 H V C CNN
+F3 "" 0 0 60 H V C CNN
+DRAW
+A 0 -26 125 1426 373 0 1 0 N -98 50 99 50
+C -100 0 35 0 1 0 N
+C 100 0 35 0 1 0 N
+X 1 1 -300 0 165 R 60 60 0 1 P
+X 2 2 300 0 165 L 60 60 0 1 P
+ENDDRAW
+ENDDEF
+#
 # PWR_FLAG
 #
 DEF PWR_FLAG #FLG 0 0 N N 1 F P