xmpp: clarify error message in example test
xmpp: update docs to mention Send/SendElement
Revert "all: new session XML read/write API"
This reverts commit 5265955b9c79963ea0c1b9f392db0e56b6a242a8.
all: new session XML read/write API
xmpp: remove lang from session creation functions
Since the lang is rarely actually used and we have an advanced
configuration now (by manually creating the Negotiator with
NewNegotiator) there's not much point to having it on the simpler
dialer/session negotiation functions. This is a breaking change.
xmpp: add missing copyright statement
xmpp: add example echobot