Add part knitting for the double bed.
Fix ThreadYarn step for double bed.
Double bed knits purl stitches.
Add MoveToDoubleBed step.
Plus and Minus on needle so we no longer need to use needle.index as much.
Add step/Basics-plan to change K assembly.
Add round knitting planner.
Cast on and knitting no longer return the yarn-flow.
Rename Needle - Needle to Needle distanceTo Needle.
Round knitting does not support pattern.
Fix Needle.-(Int).
Better failure message.
Fix handling of Needles without yarn on it.
Add MoveNeedleDoubleBed Step.
Fix for Plain/Purl stitch .orEmpty.
Fix for round cast on.
Add tube plan.
Add change assembly guide step.
View double bed in guide view.
Shorter toString on YarnPiece.