Change target to new window for 'Geodaten'
Merge pull request #49 from sargon/master

Change target to new window for 'Geodaten'
explain why geomap opens in _blank
configfile added to adjust navigation sitelink and initial gravity, friction and theta to community-fitting values
Merge pull request #52 from rubo77/configfile-2

add config-file to customize for different communities
Allow toggling of sidebar. Closes #53
Use prompt() instead of alert() for coordinates

This allows easier copy-pasting on mobile devices where one can not
select text from alert boxes.