MESSAGING: Removed a few unnecessary message types

CONNECT_REQUEST and DISCONNECT_NOTICE were removed. They served no purpose.
If you want to disconnect, then just disconnect. There is no action that
the server needs to take that it couldn't upon actual disconnection.
Similarly with connecting, just connect. If you need to check if the
connection is open, then use PING/PONG.
MESSAGING: Combined two message types, for getting single suspect

There is now just one "get suspect" message, with an internal field
describing how much data to include.
MESSAGING: Support for single-message GetAllSuspects() function

- Rather than getting the list and query'ing each suspect individually,
this function asks for all suspects in one large message.
Merge branch 'message_speed' into integration