SciDAVis - Improvements SVN-temp

- Added some more checks to Fit class;
- Added an exportImage(...) and newLegend() functions in the qti.sip file.

- yet another tweak to the context menu of Matrix column/row headers
- added "Recalculate" to Table menu as well as Table's context menu
- added "Add Function" to Graph's context menu
- several bugfixes and improvements to the scripting interface

- Fixed some crashes in the NonLinearFit class when used from a scripting window.
- Improved the Fit API.
- Added some checks to the Graph::removeCurve() method in order to prevent crashes during script sessions.

Added the docbook and html files for the manual written by Roger Gadiou.

- Improved the eventFilter of tables and fixed a bug affecting deletion of rows.
- Improved context menu for tables.
- Used Knut's titleBar idea in myWidget class in order to customize the context menu of the windows title bar.
- Added a "Go to Row" facility function for tables and matrices

- right-clicking on a Table/Matrix column/row header does not discard an existing selection
- fixed calculation of Matrix values with Python
- added compile-time option to deactivate the scripting language dialog

- several improvements and fixes to the scripting interface
- moved non-essential initialization of Python environment
to an extern Python script
- right-clicking on column/row headers of Tables and Matrices now
selects that column before displaying the context menu
- added a "Default scripting language" user setting

- Updated to last version of Qwt5 from CVS
- Improved the input checks for the Fit classes in order to prevent crashes due to bad input from the user during scripting sessions.

- added lots of doxygen comments to Scripting.h
- ScriptEdit now displays script output directly instead of on the scripting
console
- added convenience method Fit::errors to retrieve error estimates for results
- added Python constructors for Fit classes that do not need the qti.app
argument
- fixed Python interface to Fit::setInitialGuesses

- Added keyboard shortcuts to the scripting menu in the main menu bar.
- Fixed a bug in deleting fit tables operation.