doc BUGFIX single change mentioned twice
- sr_unsubscribe first parameter removed
- SR_EV_VERIFY -> SR_EV_CHANGE, SR_EV_APPLY -> SR_EV_DONE
- new event SR_EV_UPDATE (called first, but if several subscriptions, they will not get changes from the previous callbacks unless in one subscription)
-- getting changes xpath - selects specific changes, not change subtrees!
- deleting a leaf does not check the value/it can be empty! but otherwise only limited paths are accepted, no xpath
- sr_move_item() different relative item input
- error retrieval from session API slightly changed
