[aprssig] javAPRSFilter "AND" logic

[Pierre Thibaudeau]

Here is a function on my wish list for javAPRSFilter.

Exclusion filters was a nice addition to the basic "OR" logic that 
javAPRSFilter does, but I have some applications that requires "AND" type 
of logic. i.e. pass packets that meet multiple criteria. So far, I have 
found the only way to satisfy my need is to cascade multiple javAPRSSrvr.

Similar to the "-" that is used for exclusion filters, a "+" could be used 
for "AND" logic.

'73 - Pierre
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Pierre Thibaudeau
VA2AKA/VA2RKA sysadmin