SciDAVis - Improvements SVN-temp

- fixed crash when rightclicking on a table

- ported class Table from Q3Table to QTableWidget
(status: compiles but still has some issues to fix)
Remark: Renamed Table::tableCols() and tableRows()
to numCols()/numRows() for consistent naming with
class Matrix; both methods are used in many files

- Fixed scaling of fonts in 2D plots.
- Added a "Recalculat"e item to the Matrix menu.

- fixed German translation of [Del] and [Return] keys

- added German translation for "Ctrl" and "Shift"

- ran "lupdate" and fixed the german keyboard shortcuts

- Fixed bug 010935: index from Data Reader does not match with table index and did some cleaning to the code.

- Fixed Bug #10936: Nonlinear Curve fit window keeps focus.
- Fixed behaviour of the Project Explorer.
- Cleaned the LegendMarker class.

- merged trunk up to rev 480 into the devel branch

- Added histogram import