more styling changes (for node.active and its margins / border); switch to dc to use focusActiveNodeView which calls focusKeyfield and focusValField; add a placeholder contentfield for colletion items
add nodeIdx to hn; have hn.hbs cf keys bind to nodeIdx when no key is specified (very hacky, tightly coupled to contentfield right now)
redo dc.commitAndContinue to correctly insert the nextBlank humon node; fix bugs in dc.focusAcitveNodeView: was using but nodeKey can be the empty string, which is falsy