Fix weather.pl typos.
New line skip in weather.pl.

Previously, there were 12 lines between the "START BODY OF TEXT HERE" comment
and the time in the html file downloaded from weather.noaa.gov for processing
weather information.  Now, however, the number of lines has increased to 21,
and weather.pl was not able to correctly parse the weather information.

Adapted from Debian:
http://sources.debian.net/src/wmfrog/0.3.1%2Bds-2/debian/patches/weather.pl-new-line-skip.patch/
Check that $tmpfolder/$station exists.

Otherwise, grep returns a "No such file or directory" error if it doesn't.

Adapted from Debian:
http://sources.debian.net/src/wmfrog/0.3.1%2Bds-2/debian/patches/20-weather.pl.patch/
Don't include wmfrog binary in tarball.

Its inclusion causes a "source-contains-prebuilt-binary" Lintian warning when
building a Debian package.