Ft

* indexBy4: ACTUALLY fixed pipe arg. The last fix was sloppy.
* indexBy0 is now the winner again, so that's the default now.

* CHANGELOG created. It's markdown.

* speed boost (probably) for multidex (removed "sum(...,[])")

* ???
* multidex
* shoulda had better verison notes here, sorry.

* flatdex
* dex entries with one member are turned into the dex dictionary values.
{1: [{"x":1}]} -> {1: {"x":1}}
* force = False
* if IS True, it grabs the first entry of each list

* indexBy0 wins the optimization war. Removed alternatives.
* Added index, which swaps the arguments of indexBy
* singletons("label", [1,2,3]) -> [{"label": 1}, {"label": 2}, ...]
* removed pprint statement from merge