SciDAVis - Improvements SVN-temp

- Modified the .pro file in order to compile QtiPlot against the liborigin version in the 3rdparty folder. Added Alex name to the copyright list in the files he modified.
- Fixed several bugs introduced be the new range plotting feature.
- Moved code related to the histograms in the QwtHistogram class.
- Fixed restoring of plot range for Box/Wiskers curves.

- Added import some 2D plots from Origin 7.5 files

- wrote new README.html

- updated the German translation

- updated extraversion and release date in Doxyfile and globals.h

- fixed loading of box/whiskers plots
- added liborigin files to qtiplot.pro

- Added support for hidding/showing 2D plot curves.
- Implemented saving/restoring of curve range and visibility. Still to be done for BoxPlots.

- Fixes some bugs and improves the CurveRangeDialog.

- Added files missing from the previous commit.
- Added support for opening Origin .ogw and .ogm files.

- Added support for plotting curves containing only a limited row range.
- Did a lot of reorganization to the code in Graph class, some functionality might be broken. Saving of curve ranges to project files is not implemented yet!