[aprssig] dead band - now multiple connects

[Bill Vodall - WA7NWP]

> 
> This also means that clients/servers which send data to APRS-IS must
> connect to only one server at a time.  Having multiple connections into
> APRS-IS will cause your packets to be dropped due to loop prevention.


Keyword here is "which send data".   The existing system doesn't take in to
account situations where an end use may be using multiple applications with
different filters.   Maybe there could be a RO flag which would allow multiple
connections.

Bill