[PD] arrowheads on cords plugin

[Hans-Christoph Steiner]

I whipped up a quick plugin to add arrowheads to cord when in  
editmode.  The arrowheads clearly show the direction that the messages  
are flowing.

.hc
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Computer science is no more related to the computer than astronomy is  
related to the telescope.      -Edsger Dykstra