Stellarium 0.10.0

What's new in this version:

- Global switch to Qt. Don't support SDL main application anymore.
- The whole StelApp class is managed by a QGraphicsScene, inside a QGraphicsView.
- Removed deprecated sources from the core of stellarium (old GUI, TUI and scripting).
- Continued API cleaning and simplifications.
- Performed large refactorings to use portable Qt API (migrated from std::string and std::wstring to QString).
- Re-organized the source files into sub-directories.
- Migrated config file parsing to a QSettings based implementation.
- Exposed some methods as slots so that they can be scripted in the future.
- Created the new Qt-based GUI button bars (QGraphicsItems).
- Recoded from scratch the new QWidget based GUI rendered in the QGraphicsView using style sheets.
- Moved stars/planets halo rendering into SkyDrawer.
- Implemented dynamic eye adaptation for bright objects.
- Optimized atmosphere computation and others, speed can be increased up to a factor of 2.
- Implemented light pollution following the Bortle scale index.
- Improved and optimized stars rendering (updated colors, sizes and added large halo for very bright ones, use GL lists for drawing stars by bunch)
- Made testing python wrappers using SIP (unused)
- Created a new SkyTile class supporting lazy dynamic multi-resolution images loading and display. Image trees can be stored as JSON files.
- Startup is much faster.
- Migrated the previous nebula textures to the new format.
- Added a LocationManager for managing observing locations and cleaned the code of observer.
- Changed key bindings, use F1.. F6 for opening dialogs.
- Tab completion on the search dialog.
- Added descriptions for the sky cultures and improved the ones for landscapes.
- Added a new mars landscape.
- Fixed many bugs.