SciDAVis - Improvements SVN-temp

- implemented handling of selections in TableView

- layer buttons now have their own context menu

- simplified/improved MatrixDialog to be more intuitive

- fixed "enumerate all to the right" in TableDialog
- removed 2 obsolete xpms in PlotDialog
- fixed some references to icons

- moved "preferences" from view to edit menu
- implemented goToCell() for tables and matrices
and replaced "go to row" by it

- fixed another crash in the project loading code

- improved locale support in FitDialog
- fixed crash when appending a project
- "column options" and "set column values" dialogs:
added a combo box for direct column selection and
rearranged the layout a little bit
- fixed crash when selecting "set column values" in
a table with no columns

- ASCII import dialog: changed "import decimal separators" to "use custom
decimal separator"
- ASCII import dialog: moved the "help" button into the lower right corner
- ASCII import dialog und preferences dialog: changed "system locale setting"
to "default (...)"
- preferences dialog: added a preview box for the numeric format
- column options and set column values dialog: changed the "<<" and ">>"
buttons to "<< prev." and "next >>"
- added support for custom QLocale handling in the fit wizard
- renamed the "data" menu to "tools"
- added a submenu to show/hide toolbars to the "view" menu

- made matrix and table loading/saving independent
of the decimal separator settings

Fixed some details on the website.