[sr-dev] new pv for presence subscriptions

Hi, we would like to add a new pv $presentity (or better name) to be set on presence handle_subscribe. the reason for this is that we need the presentity of the subscription to carry on further tasks in the script and the To header not always carries the right information on re-subscriptions. handle_subscribe will take the presentity from Request-URI if no to-tag is sent or it will take it from hash/db if to-tag is present. is that ok to proceed with implementation ? Best