Rollers on a single pass

[kausalyamahadevan]

If there is x-add-roller-advance before transfers, this should only be added to the FIRST transfer pass. Right now it is added to all (four) transfer passes, leading to too much roller movement

Originally posted by @kausalyamahadevan in #5 (comment)

[kausalyamahadevan]

I just wanted to add --
The suggested method for transfers according to the kniterate developers is to have the last row of knitting before transfering correspond to less pulldown than standard knitting, and the last pass of transfers include a small amount of pulldown as set up for the knitting.
I think that it would helpful to have either another x-add-roller-advance or the option to force this one to add the roller amount to the PREVIOUS carriage pass, but I imagine that it wouldn't make a huge difference if it's added to one pass or the next.