SciDAVis - Improvements SVN-temp

- ported class Note to Qt4
- tweaked the way ApplicationWindow's status is set to modified/unmodified a little bit

- ported some more parts of ApplicationWindow (lists, text edits)
- ported analysisDialog and renamed it to DataSetDialog
(this fits the dialog's function much better)

- ApplicationWindow: ported all actions and tool bars to Qt4
- adjusted the icon sizes of the toolbars
(Qt4 default size was a waste of space)
- resized the "save project" and "new matrix" icons
to look better in the toolbars
- did some code cleanup
- changed version to 0.9.0alpha1

- ported myWidget to Qt4 and renamed it to MyWidget

- code evaluated or executed in a ScriptEdit uses the correct context
- users can now set local variables also when evaluation code (e.g. when
setting column/matrix values)
- fixed bug that kept errors from being reported when evaluating expressions
in a ScriptEdit
- fixed superfluous-newline bug in restore of axis formulae

- Updated to the last version of liborigin
- Improved saving state of the dock windows and tool bars
- Improved import of Origin projects (arrange tables in cascade)
- Fixed bug in plotDialog (crash when user deletes last curve using the Key_Del)

- ported ApplicationWindow::saveSettings und ::readSettings to Qt4

Changes to ApplicationWindow:
- added "Visit QtiPlot forums" to help menu
- added "Report a bug" to help menu
- ported open_browser() to Qt4 and added more browsers

- fixed compiling errors from revision 42

Added the "Search for &Updates" item to the Help menu