SciDAVis - Improvements SVN-temp

- Implemented feature request #3383: Copy datapoint to clipboard.
- Removed transparency by default in 2D plots, since it's a major cause of performance slow-down!

- Improved support for the Date format.

- Fixed crashes in AxisDialog when changing the axis type to Time or Date format.
- Fixed a small bug in PlotDialog (symbol size for Box/Whiskers Plots)

- Fixed some bugs in PlotDialog and Graph class.

- Fixed bug 010938: Plot Window geometry.
- Improved the PlotDialog: now QtiPlot remembers the state of the dialog (extended or shrinked).
- Did some clean-up in MyWidget class.

- fixed list view item spacing in ConfigDialog
- fixed some issues in the German translation

- Fixed hang on MacOSX during graph import from Origin
- Added grid settings import from Origin
- Added import of *.ogg files(Origin graph)

- Improved the PlotDialog: it can now be extended to show the plot window explorer or shrinked to show only the basic controls.

Deleted PieDialog files, since PlotDialog now handles every kind of plot curve.

- Changed the behaviour of PlotDialog, AxesDialog and LayerDialog.