FLUID-4035: All tests passing for basic pager for the first time. Fixed conditions in DataBinding for auto-transactions - a PostGuard should trigger these too. Still several issues with model idiom - need to think more about event sequence on startup. Listeners which are sensitive to deltas should in theory receive initial "delta from nothing" as model is populated on startup. Timing of this event is problematic though - model is really populated "early" through gingerness, but many listeners will not really be ready until onCreate. However, we could still supply a synthetic empty "oldModel" for this special event. Still raises the issue that crucial guards (e.g. pageCount) may not execute until late into the lifecycle. Also may upset a lot of existing code with this unexpected extra event.