SciDAVis - Improvements SVN-temp

- 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)

- AbstractFilter and AbstractSimpleFilter improved.
- Tried to make type conversion filters more readable.
- DateTime2StringFilter works around bug in QDate::toString().
- Added conversion filters Double2DayOfWeek, Double2Month, DayOfWeek2Double
and Month2Double.
- StatisticsFilter checks for validity and shows slightly better performance.
- Unit tests compile separately and have better error reporting.

Implemented feature request #002305: Inserting like in Origin.