Don't rely on clients sending the exactly protocol strings '1.00'

Don't rely on clients sending the exactly protocol strings '1.00'
and '2.00'.  Anything that starts with a '1.' is a "revision 1"
protocol string and anything that begins with a '2.' is a
"revision 2" protocol string.  That way, when a clients reports
that they support protocol revision '2.0S', we will properly
react and send revision 2.00 messages.