[aprssig] Weather Formats and New Radiation Parameter

[Robert Bruninga]

Update to APRS WX formats

A new radiation field Xxxxx has been proposed by IZ6RDB for the
reporting of background radiation levels from such equipped
weather stations.  This was proposed months and years ago, but I
cannot find where it ever formally made into the APRS weather
spec addendum 1.2.

So I have now added it as a proposal.  We need to define the
value field "xxxx" to be between 3 and 4 bytes, so we need an
agreed set of units?  Any experts care to comment?

Additionaly the provision for FLOOD levels and battery VOLTS was
added back in 2006 and so I have folded those into the same
overall APRS12 update in this new file:

http://aprs.org/aprs12/weather-new.txt

I will admit that in the past, I left most of the Weather
details to Dale Hugley and never fully documented what was going
on with weather warnings, etc and left the documentation of such
up to others.  If Dale has moved on to other things, who is the
new weather czar that is filling that coordination role? And can
make sure that we have a single reference for Weather stuff...

Bob, Wb4APR