Tweaks to robot display:
* If there is a destination for a rebot, display that as a shadow circle. Draw a light grey line from source to destination. * If an orientation is in the location_info table, the current location circle gets a stick drawn in that direction. * If the destination has an orientation in the nodes table, the shadow circle gets a stick drawn in that direction. * I added a little bit of code so that labels are drawn on top if the orientation stick would draw through it. I'm sure that will interact with cropping badly if a node is right at the edge of the picture.
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