We now fire three events:
* subscription_add_done - fired when subs.js has finished handling a
subscription_add event (all structures are set up, etc.)
* subscription_remove_done - fired when subs.js has finished handling a
subscription_remove event
* sub_obj_created - fired when subs.js has created a sub object. This
happens both when a new subscription is added and at page startup for
all existing subscriptions
These events are fired whenever sub objects are created, even when
not tied to a subscription event.
(imported from commit a4863451f37e7fdbad480696b388ea788b01d6b9)
ceac6b0613