SciDAVis - Improvements SVN-temp

- Implemented Feature Request #3476: "better plot Ascii data".
- Partially implemented Feature Request #3511; only the part concerning moving of data points: now one can restrict the movement to horizontal or
vertical via e.g. Alt and Ctrl keys, respectively.

- removed base class QObject from AbstractColumnData
and added method asQObject() instead
- implemented TableAppendRowsCmd
- improved handling of invalid cells
- improved handling of user input
- added "virtual QUndoStack *undoStack() const" to MyWidget
- moved the table undo stack to TableModel
- updated the test program and fixed some bugs

- implemented handling of user input by the undo system

- implemented some table commands
- add tests for the commands to the test program
- hunted down some nasty bugs
- implemented automatic horizontal header resizing
when comments are shown/hidden

- Implemented a possible solution for Feature Request #3436: "No white border around ps, eps and pdf".

- Fixed bug #011378: "rc2: Crash with analysis translate vertical".
- Improved Python interface for the Table class: setCommand() and setComment().

- Improved handling of Line and LegendMarker objects via the Python scripting interface.

- Improved handling of Line and LegendMarker objects via the Python scripting interface.

- fixed the fitplugin project files to work on 64bit Linux

- Fixed exporting of ScriptEdit to ASCII files.