Log Message:
Update to gipfel-0.2.7.

gipfel-0.2.7
* Import data from http://www.viewfinderpanoramas.org/ with the
  kind permission of Jonathan de Ferranti. Thanks a lot!
  This brings the number of peaks in the default data file to
  more than 21000!
* Change display style a bit and reduce font size to make room
  for all the new peaks from the updated data file.
* Show height and distance of the peak which is currently under
  the mouse.