In Penknife, moved the core definitions into makePkRuntime() from PkRuntime#init_().
In Penknife, made the yoke carry the pkRuntime value, but didn't use it yet. We're building up to a more pure system thanks to the AVL tree implementation of strMap().
In Penknife, made the definition queue into a simple jsList.
In Penknife, made the initial state of a PkRuntime be provided through the constructor.