[Users] DROP statement

[Bogdan-Andrei Iancu]

Hi there,

The core "drop" statement has a new special meaning in some route types (by default it's equivalent to "exit"):
	- BRANCH ROUTE - the request branch is discarded (not fwd);
	- ONREPLY ROUTE - if provisional reply (<200), it will be discarded (not fwd, not stored, but only timers updated);

Wiki will be updated soon with this text ;)

regards,
bogdan