Privileged Entity update + Pubsub Account Management partial implementation + Public Pubsub Subscription /!\ pgsql schema needs to be updated /!\ /!\ server conf needs to be updated for privileged entity: only the new `urn:xmpp:privilege:2` namespace is handled now /!\ Privileged entity has been updated to hanlde the new namespace and IQ permission. Roster pushes are not managed yet. XEP-0376 (Pubsub Account Management) is partially implemented. The XEP is not fully specified at the moment, and my messages on standard@ haven't seen any reply. Thus for now only "Subscribing", "Unsubscribing" and "Listing Subscriptions" is implemented, "Auto Subscriptions" and "Filtering" is not. Public Pubsub Subscription (https://xmpp.org/extensions/inbox/pubsub-public-subscriptions.html) is implemented; the XEP has been accepted by council but is not yet published. It will be updated to use subscription options instead of the <public> element actually specified, I'm waiting for publication to update the XEP. unsubscribe has been updated to return the `<subscription>` element as expected by XEP-0060 (sat_tmp needs to be updated). database schema has been updated to add columns necessary to keep track of subscriptions to external nodes and to mark subscriptions as public.

--- a/sat_pubsub/const.py	Mon Jan 03 16:48:22 2022 +0100
+++ b/sat_pubsub/const.py	Wed May 11 13:39:08 2022 +0200
@@ -59,8 +59,13 @@
 NS_PUBSUB_RSM = "http://jabber.org/protocol/pubsub#rsm"
 NS_FORWARD = 'urn:xmpp:forward:0'
 NS_FDP = 'urn:xmpp:fdp:0'
+NS_PPS = 'urn:xmpp:pps:0'
+NS_PPS_SUBSCRIPTIONS = "urn:xmpp:pps:subscriptions:0"
+NS_PPS_SUBSCRIBERS = "urn:xmpp:pps:subscribers:0"
 NS_SCHEMA_RESTRICT = 'https://salut-a-toi/protocol/schema#restrict:0'
 
+PPS_SUBSCRIBERS_PREFIX = f"{NS_PPS_SUBSCRIBERS}/"
+
 FDP_TEMPLATE_PREFIX = "fdp/template/"
 FDP_SUBMITTED_PREFIX = "fdp/submitted/"