Overhaul EOB handling... just count them, and reset both to zero on non-EOB

in either direction.

For v1.0, a single EOB in both directions terminates the session and for
v1.1, two EOBs in both directions terminates.

This should greatly simplify the overly complicated senteob/sentempty/goteob/
gotempty logic and completely eliminate loops.  Biggest risk with this change
is issues with v1.0 servers.