Health bar update 0.5.5-DR1

[smogo]

suppositions :

#commands call the server for information, and the server replies much like a tell, so HP is what server knows, but not what client has computed. Client does not update its state from this command, it just prints the server message in reply to #command

group info is sent by the server. The client has no way to call other clients for actual client-side-thought values. Thus it uses what the server tells.