SciDAVis - Improvements SVN-temp

- Improved the MultiPeakFit class.
- Added more options to the configDialog in order to customize the MultiPeakFit curves.
- Changed the analytical expression used for the Gauss function in order to make it similar to the definition used by Origin. The old Gauss function in QtiPlot was replaced in the non-linear fit dialog by GaussAmp, since this is the name used for it in the built-in fit functions library of Origin.
- The fitting API should be stable and in a nearly final state, please test it if you have time.

added some missing Q_OBJECT lines

- Improved the Fitter class as suggested by Knut and fixed some bugs.
- Added the possibility to do multi-peak fits with Gaussien and Lorentz profiles via the non-linear fit dialog.

removed superfluous includes in analysis.cpp

- Fixes bugs in the non-linear fit dialog.
- Adds polynomial fits to the list of built-in fitting routines in the same dialog.

- Improved the configDialog in order to include settings for the fitting sessions.

- Fixed bugs in MultiPeakFitter class and did some code polishing.

- Updated to the last Qwt5 version from CVS which fixes several bugs: export to SVG, grid/ticks misalignment and inner/outer ticks misalignment.
- Improved the abstract Fitter class and added derived classes: NonLinearFitter, PluginFitter, MultiPeakFitter (still to be improved).

- New update of Qwt5 from CVS
- Added mising Fitter.cpp file.
- Converted files toDOS mode.