SciDAVis - Improvements SVN-temp

Ported the FFTDialog and the IntDialog to pure Qt4.

Ported FilterDialog, InterpolationDialog, SmoothCurveDialog and ScriptingLangDialog to pure Qt4.

Ported the AssociationsDialog to pure Qt4.

- ported changes up to rev 145 into the trunk

- added compile-time auto-detection of Python version
- added tentative hack for Python 2.5 on Mac OS X

- Improved search for updates by storing the file version number to an internal buffer instead of a file on the hard drive.
- Changed the geometry of a ColorButton in order to make it display correctly on Mac OS X.
- Fixed export of 2D plots to image formats on Mac OS X.
- Added functions for importing images and plotting spectrograms to the scripting interface.
- Improved the axesDialog.

- ported changes up to rev 142 into the trunk

- Added the possibility to define independently of each other the colors of the axes backbones and of the axes numbers in 2D plots.
- Modified the way plot markers are saved/restored to/from project files.

- updated devel branch to the current state of the trunk

- ported changes up to rev 141 into the trunk