[Ham-Mac] METAR data on internet

[w1hkj]

NOAA has capriciously changed the access URL for fetching METAR data 
from it's various sites.  It is now

http://tgftp.nws.noaa.gov/data/observations/metar/decoded/ (default for 
fldigi)

followed by the metar station designator .TXT in upper case.  For example:

http://tgftp.nws.noaa.gov/data/observations/metar/decoded/KHSV.TXT

for Huntsville, Alabama weather.  Entering the full URL on any browser 
should give something like:

HUNTSVILLE INTERNATIONAL  JONES FIELD, AL, United States (KHSV) 34-39N 086-47W 191M
Aug 08, 2016 - 12:53 PM EDT / 2016.08.08 1653 UTC
Wind: from the E (100 degrees) at 6 MPH (5 KT):0
Visibility: 10 mile(s):0
Sky conditions: partly cloudy
Weather: Towering cumulus clouds observed
Temperature: 88.0 F (31.1 C)
Heat index: 94.6 F (34.8 C):1
Dew Point: 72.0 F (22.2 C)
Relative Humidity: 59%
Pressure (altimeter): 29.92 in. Hg (1013 hPa)
ob: KHSV 081653Z 10005KT 10SM FEW025 SCT035TCU 31/22 A2992 RMK AO2 SLP123 TCU VC E T03110222
cycle: 17

This is the date that fldigi parses for the <WX:xxxx> and <WX> macro tags.  I am changing the code in fldigi
to allow the user to change the METAR url with the default as indicated above.

This will be included in the next release of fldigi (3.23.14).

73, David, W1HKJ