Remove obsolete XML-RPC polling functions.
Improve debug when adding/removing payloads.
Allow monitoring parties to discard payloads they don't need anymore.
Decrease refcount on payloads not polled on session cleanup.
Error out if xmlrpcsrc fails (mostly when it's stopped).
Signal all the waiting http connections when the application exit.
Process packet listeners as late as possible to have the maximum info in the stack.
Rewrite proto filters to use the new set of common functions.