add maps-for-free relief map
and add (extra) attribution for all maps
allow datasets to have a defined shape (graphic)
allow user to change color or graphic (shape) of dataset via table header
Merge branch 'shapeChanging'
set shape/color changing default off
Merge branch 'origin/fuzzytimeline'
update README: add new feature
generate new build
Merge branch 'origin/master'