XSL's to get, sunset time via earthtools.org

Earthtools.org calculates for you the civil, nautical and astronomical
sunrise and sunset times. For shutters down timing I prefer the use of
the civil twilight time.
See http://www.earthtools.org/webservices.htm#sun for more info on how
to use them.
See earthtools-sunset-sunrise.items.example in items how to use the
xsl's.
Revert "XSL's to get, sunset time via earthtools.org"

This reverts commit 9cb79605234f57148ba2111692425d3ba1bd5894.