Add option to build Qt apps, and start weatherstations demo
Copy example file from VTK wiki for using QVTK

Because my first vtkMap integration crashes
Insert QFrame as main widget, make QVTKWidget a child
Add vtkMap to display

Map is rotated in 3D for some reason
Also reorganize includes & update comments
Fix interactor logic (thanks Aashish)
Add interim fixes and callback for mouse events

* map->SetCenter() NG, so start at zero again
* interactor logic was NG
* Grab *all* events so that map redraws when translated
Replace callback function w/vtkCallbackCommand subclass

Handles scroll and drag events
Add #define to include/exclude widget with the test sphere.

And adjust size of the map widget to fill space.
Update wsmap code, based on lessons learned with RenderWindowNoUiFile.cxx

Leave RenderWindowNoUiFile.cxx example in for now (may delete later)
Add VTK Headers to source files
Add qtMapCoordinatesWidget to main window

A hopefully-reusable component for display-edit of lat/lon/zoom
Recast wsmap to use Qt designer for main window
Add handlers for buttons (although not fully functional)
Update app to request station info (json) from openweathermap.org
Add cJSON to vtkMap, initially for parsing reply from openweathermap.org
Add code to parse weather station (json) object and display text info
Delete the no-longer-used qtWSMapMainWindow class

Replaced by qtWeatherStations
Fixed initial position and set center not working
Added means to preserve non-map actors
Fixed missing tiles when zoomed in