#1 weird pipe behaviour

[Dan Bethell]

when a pipe is added which should cancel out an already
existing pipe the behaviour is not as expected.

i.e.
compost:connect( nodeA.output, fileout.input )
compost:connect( nodeB.output, fileout.input )
fileout:work()

this causes fileout (a file:out node) to save an image
but it is the output of nodeA instead of nodeB.

Odd.