Change default flood rates to match RFC1459, prevent excess flood problems

I noticed that the default network flood rates are wrong (for most
networks). It has been very standard since the beginning of IRC to use a
value of 2 seconds per line, with a 10 line head start. Almost all
networks work this way, and if you don't follow, having a lot of
channels or a lot of clients connected to ZNC results in excess flood
disconnections and much frustration for the user.

I think you should make the default value for these 2 and 9 instead of 1
and 4 so that this nasty bug doesn't hit people who will not know how to
debug it. You find these same types of settings built into every IRC
client. 2 and 10 is the standard. 2 and 9 provides a slight buffer so
there is no mistake.

Thanks
-Rubin

Close #1416

src/IRCNetwork.cpp

@@ -152,8 +152,8 @@ CIRCNetwork::CIRCNetwork(CUser* pUser, const CString& sName)
       m_uServerIdx(0),
       m_IRCNick(),
       m_bIRCAway(false),
-      m_fFloodRate(1),
-      m_uFloodBurst(4),
+      m_fFloodRate(2),
+      m_uFloodBurst(9),
       m_RawBuffer(),
       m_MotdBuffer(),
       m_NoticeBuffer(),