SciDAVis - Improvements SVN-temp

- Implemented Smoothing and FFT filtering of 2D curves in stand-alone classes.
- Same for FFT + a first attempt to unify FFT on tables with FFT on 2D plots.

- promoted version number to 0.9.0beta1
- fixed a typo in the German translation
- simplified the way files are loaded
from the command line (and fixed several
bugs by doing that)
- fixed the progress dialog behavior in
ApplicationWindow::openProject()
- extended the handling of command line arguments
(type "qtiplot -h" for info)
- fixed the path where QAssistant is looked for
(it is $PATH or %PATH% now, respectively)
- moved version number/release date constants
into a seperate header file 'globals.h'

- Fixed crashes triggered by right-clicking on a SelectionMoveResizer.
- Clicking on an axis selects and raises a layer, anywhere else just activates it.

- adjusted the context names in all translation files
- fixed a crash when loading project files
- added japanese translation to qtiplot.pro

- copying current translation files from the scripting
branch to the trunk

- removing outdated translations in order to
be able to copy the 0.8.9 translations
into the trunk (with full history)

Some fixes to selection of Graphs.

- Improved the interpolation and implemented it in a new class.
- Added files forgotten in the last commit.

-First implementation of the abstract Filter class, to be used as base class for all data analysis operations.
-Implemented numerical integration/derivation using this approach.
-Fixed some bugs linked to the display of the legends in 2D plots.
-Did some cleaning in the headers of ApplicationWindow.cpp.

- Fixes bugs 010440, 010320 and 010154.