Dedupe GUI prototype

TODO:
* upstream patches to FineDiff:
    case-insensitive match, but caseful result display
    handle utf-8
* mark page changed and confirm onbeforeunload until ajax completes
* 13 seconds for a batch page of 100, 4 seconds for 20.  Too slow!
* consider N-way dedupe ripple effects of actions
* batch size knob for "assign me". criteria: amount, country, civi group
* completed batches
* Civi Contact view shows recommended or scheduled actions in Activities or new tab.

Change-Id: I22643fc915501ad545724e5bbcccdc2dcc1eec0c
Merge "Dedupe GUI prototype"