Add SaveSetRestorePriority and SaveSetRestorePriority_Max.
Change the PullFrom methods and callables so they return the deltas that are concurrent or later than the passed-in timestamp. Callers are then responsible for joining the timestamps from the deltas.
Name change ZAccumulator_T-->Accumulator_T.
Variant that lets one establish a guard without automatically acquiring the mutex.
Add pseudo-ctor that takes a name/attr, so we can consume 'stanzas' (like in XMPP).
Add the notion of a ChannerCombo -- a structure that holds a set of channers with the appropriate suite of capabilities.
Add ZRelGuardR and ZAcqGuardR
Fix the locking protocol, and especially make sure we're broadcasting the condition when we change state.