[Development] Changing qreal to a float

[andre.poenitz at nokia.com]

Olivier Goffart wrote:
> > I thought we were agreeing upon deprecating qreal (i.e leave it as-is)
> > and use float and double explicitly inside Qt. At least, that's what I
> > +1d for :) The patch above changes qreal and doesn't deprecate it.
> 
> Can be done in another commit,
> One after the massive s/qreal/float/g in the code.
> If we really want that...

The  s/qreal/float/g  cannot be undone easily for custom builds, so it should 
only happen if there's a way to reproduce currently existing functionality 
(e.g. by  adding QRectD classes, possibly conditional on some  QT_NO_*
or similar)

Andre'