SciDAVis - Improvements SVN-temp

- Updated to last version of Qwt5 from CVS
- Added a Canvas color button in pieDialog. Removed superfluous functions in pieDialog and Graph classes
- Improved the way the new window names are handled in ApplicationWindow

- Added a "Save Note As..." item to the title bar menu of a Note window and removed "Export" from the context menu.
- Removed Minimize/Maximize window items from the title bar menu and rearranged the other items in order to get an Origin-like menu.

- added text import/export to ScriptEdit
- output from "Execute All" now goes to the end of the Note (instead of cluttering up the code)
- changed some user-visible texts referring to Graphs (MultiLayer) as "Plots" for consistency
- fixed a bug in the Python interface

- Reorganized saveSettings()

- Fixed a bug affecting the 2D plot legend after adding/removing curves.
- Fixed crashes in analysis code: FFT, smoothing, filtering and interpolation due to buggy memory deallocation in conjunction with Graph::addResultCurve()
- Reorganized the readSettings() (I must to do the same with saveSettings() )

- Changed method name Fit::setFitCurveParameters() to generateFunction()
- Improved adding new curves to 2D plots.

fixed bug #7910 (Disapperaing of the buttons in the maximized sub-window)

- improved output placement in notes
- Python init file now imports all QtiPlot classes into the global namespace
- fixed a bug in the FFT code (FFT filters crashed)

- 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