not needed and its usage is buggy when the context is registered
to multiple pending commands.
+ o Add perhaps an option of setting the nickname to the client context.
+ If set (and username != nickname) the client libary would send NICK
+ command to the server after connecting to automatically set the
+ nickname.
+
o Additions to do after protocol version 1.1:
o Fix the NICK_CHANGE notify handling not to create new entry