working a bit on making appengine become a proxy for noaa
Merge branch 'master' into appengine_noaa
initial implementation of server as noaa proxy
fetching forecasts through appengine server (caching not yet implemented)
removed some old code
now caching meteograms/soundings
added cleaning of cache
put SERVER_URL in FlyWithMe. not sure if this will have some impact on memory, likely not
new version for appengine