Last coordinates in a LinearRing should match the first ones.
Also fix one unit test which was failing because of this invariant.
Move the polygon and have the shape always stay the same without getting
distorted.
Osm files can now be loaded for editing using the annotate plugin.
Added Copy/Cut options on placemarks/polygons.
REVIEW: 119555
The issues mentioned in the review request will be solved when the
deep copying of placemarks will work properly.
Allow cancelling and reverting of tour recordings properly
REVIEW: 119700
Small bug fix in GeoDataStyle::operator==
Add polyline drawing and customization
REVIEW: 119732
merge setupList() into getAdditionalItems() for simplicity
introduce docked placemark info widget

Viewing placemark information such as Wikipedia articles is currently done via a floating dialog. While it apprears quite
stylish, it covers nearby items such that they can't be clicked or it is moved out of scope when the globe is rotated.
These two properties of the floating dialog get in the way when exploring the world.

To improve the browsing experience, a dock widget containting a web view is used. In order to visually associate the view
with an item, a thin line is drawn between them. This improves the browsing experience since the dock widget always remembers
the last position and size no matter how the user scrolls around or clicks different items. It also doesn't cover nearby
items. As a result, exploring Wikipedia articles and photos is much more addictive.

This patch is still work in progress. As such, it has of course issues such as the line being always drawn or the line not
following the corner of the dock widget. Still, I want to get feedback if the general direction is right. Also, the dock
widget should probably only be used for detailed placemark information, but not e.g. for balloon-style information. Note that
even if I temporarily abused the PopupLayer to power the dock widget, I don't intend to remove PopupItem altogether (it could
still show balloon-style information).

I'm looking forward to your feedback!
activate Panoramio plugin
jsonparser
add config dialog
debug++
wip