bindings t is the bindings of t at the time of the call.
val after : t->string KeyMap.t->string KeyMap.tLwt.t
after prev waits until the current bindings are different to prev and then returns the new bindings.
val got_new_commit : t->string ->string KeyMap.t->string KeyMap.tLwt.t
got_new_commit t key prev either waits until a new commit (empty write) has been written to key into the qubesDB t, or the entries starting with key are different from prev. Returns the entries starting with key.