Fixed issue with MockDDG tests when Main.debug = true.
Refactored Master and Worker to use Futures instead of awaiting.
Also made some edits to reduce, added some tests, killed some rotting code.
Lift now propagates through the subddg before reattaching.
Fixed a bug with ModUpdatedMessage.
Turned debugging back off by default.
Added reduce to ChunkList.
Updated WC to use HashMap.merged.
Added a script for manipulating xml files.
Added variable sized chunking wordcount to Experiment.
Fixed compilation issue with WordcountTest.
Stopped generating unnecessary ModIds for Dests.
Fixed a bug where we weren't processing nodes in the right order by switching
from a PriorityQueue to a TreeSet.
Added Datastore.removeMod for better encapsulation.
Fixed a bug in the last commit.
Added memoization to DoubleModList.reduce.
Created ModList(Node/Modifier/etc).
Reverted all changes, added Mod2, ReadN
Merge remote-tracking branch 'origin/master' into experimentMods

Conflicts:
	core/src/main/scala/tbd/mod/DoubleModList.scala
	examples/src/main/scala/tbd/list/ChunkMapAdjust.scala
	examples/src/main/scala/tbd/list/FilterAdjust.scala
	examples/src/main/scala/tbd/list/MapAdjust.scala
	examples/src/main/scala/tbd/list/WCAdjust.scala
Merge with upstream, isolated nontbd experiment code.