SciDAVis - Improvements SVN-temp

- Fixed import of symbol-containing plots with automatic coloring

- Added import(7.5) of some plot axes settings
- Fixed import(7.5) of Text&Numeric datasheets

- Fixes deletion of fit tables from the main window "Edit" menu.
- Fixes translation behaviour of some recently added actions.

- Fixes functionality in Graph::deleteFitCurves() and some crashes in FitDialog.

- Fixes a crash when FitDialog starts in a project with no tables.
- Fixes a crash occuring when trying to fit Function curves.

-Fixes a warning in LegendMarker.cpp

- Added support for Origin legends to LegendMarker class.
- Disabled "View Pixel Line profile" in ImageMarker context menu.
- Slightly improved the drawing of Pie curves.

- another minor correction to the German translation

- updated the German translation
- replaced the other translations with the ones from the homepage
- updated the translation files to refer to the new file names

- fixed loading colors from older project files
- fixed/improved several issues concerning the colors in ColorBox
- minor adjustments to README.html and qtiplot.pro