kml2bbd: show maximum three warnings
Strassen::KML: new method kmldata2bbd (like Strassen::GPX::gpxdata2bbd)

With test cases.
Strassen::KML: support for point placemarks
Strassen::KML: test warnings for unhandled placemark elements
data update
fix new perl 5.21.6 warning

'Unescaped left brace in regex is deprecated'
data update
Merge remote-tracking branch 'eserte/master' into world