m_spanningtree Warn instead of sending SAVE if we change the nick of a non-local user outside of a command handler
m_spanningtree Set the TS of the uuid nick to the same value on collision
m_spanningtree Remove duplicated code from TreeSocket::Outbound_Reply_Server()

This is implemented in CheckDuplicate()
m_spanningtree Deduplicate auth finish code
m_spanningtree Deduplicate server auth code
m_spanningtree Don't pointlessly copy strings in SERVER handlers