SciDAVis - Improvements SVN-temp

- 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.

- extended 'testprog' to display all possible types of columns

- improved handling of [Return] in TableView
- inverted the behavior of the validity attribute:
now valid is the default for any row and you use
setInvalid()/isInvalid(). Since rows are rarely
invalid, this seemed the better choice.
- removed validityChanged()/validityAboutToChange()
from AbstractDataSource.
Use dataChanged()/dataAboutToChange() instead.
- some small improvements to other classes

- Added LegendMarker and ApplicationWindow::renameWindow() to Python scripting interface.
- Fixed a bug in restoring of Notes from project files.
- Improved ScriptEdit (only plain text copy/paste allowed)