BrowserInfo: warning fix (with test case)

Warning was introduced with last BrowserInfo.pm commit.
bbbikegooglemap.cgi, bbbikeleaflet: set msapplication-config=none

As suggested by
http://msdn.microsoft.com/en-us/library/ie/dn320426%28v=vs.85%29.aspx
BBBikeOsmUtil: changed query to Overpass API

The previous query missed parts of ways at tile borders. Now the whole
way is always plotted.
new script check_comments

Formerly implemented as inline perl in Makefile. Now moved to own
file, with better diagnostics.
BBBikeOsmUtil: use the French Overpass API server
new geocaching.com URL

The zoom parameter did not seem to work with the old one.
fixed bikemap.net URL
disabled link to sautter map (does not work anymore)
insert_points: decode_for_file

Decode checkbutton labels correctly for bbd files which are in utf-8
decoding. This was disturbing since landstrassen2-orig was converted
to utf-8. Previously ort2-orig (amongst others) was already in utf-8,
but insert_points does not show a label for one point features.
insert_points: show names also for one-point features

Formerly, the change dialog showed only labels for line features.
With this change decode_for_file() is called earlier.
SRTShortcuts: use new convention for "weighted bbd" files

Also, renamed a "my $b" to "my $btn" to avoid warnings with modern
perl.
temp_blockings_dates.t: fix a rare clock change problem

This test used to fail in the autumn when clock was switched from
summer time to normal time, if it run between 2 and 3 o'clock. Now
using POSIX::mktime() instead of Date::Calc::Mktime(), because it can
use DST information.
data update