resync v0.0.1 (TODO: integrate with serialization code, use
IWriteAccess, UI test)
resync v0.0.2 started integrating with serialization util code
add change notification listener AFTER linking only (fixes test failures
from previous commits)
Handstand to get access to IXtextDocument (IWriteAccess) from within an
IDerivedStateComputer
integration test for IUnitOfWork stuff