Fixes for threading bugs#2

Open

benoitg wants to merge 3 commits intoakuchling:masterfrom

Commits on Nov 19, 2013

Improve/add debuging to make it easier to debug
benoitg
committed
Fix jwz algorithm. In 1b, when continue was invoked, prev = container was not executed, frequently causing 1c to be executed on a granddparent. This manifested as messages being threaded to one o…
benoitg
committed
Add another missing chunk of jwz algorithm, to tolerate incorrect references in other messages. Includes unit test
benoitg
committed