Fix possible crash on import of projects into creator with
only one valid Qt version set up.

Reviewed-by: dt
Task-number: QTCREATORBUG-1017

 ... in the TargetSetupPage.

 Make sure that if there is only one thing we can check that it is checked.

Reviewed-by: dt

Using canonical paths breaks with symlinked components. Also the editor
filename isn't canonical, so comparing them breaks.

This reverts commit efcdadd2.

Also unify path handling somewhat

Task-number: QTCREATORBUG-81
Reviewed-by: Friedemann Kleint

Reviewed-by: Roberto Raggi

Reviewed-by: Roberto Raggi

Also change the filename->document map to a hash.

Reviewed-by: Roberto Raggi

Extend the environment instead of clobbering
it with the Python setup.
Reviewed-by: dt

in my quest to de-virtualize the ProItems i also devirtualized their
d'tors without providing a replacement. whoops.

Reviewed-by: dt
Task-number: QTCREATORBUG-1003

Otherwise the paths may end up with ../ or /./ in them and confuse the
Qml import resolving.

Reviewed-by: Thomas Hartmann

We no longer allow it to collapse below it's size hint.
I also reduced the bottom margin.

qmlRegisterType<QDeclarativePen>("Qt",4,6,"Pen");
qmlRegisterType<QDeclarativeScaleGrid>("Qt",4,6,"ScaleGrid");

Rectangle and BorderImage work now

QDeclarativePropertyMap changed

void valueChanged(const QString &key, const QVariant &value);
==>
void valueChanged(const QString &key);

Task-number: QTCREATORBUG-863
Reviewed-by: Friedemann Kleint

Task-number: QTCREATORBUG-948
Reviewed-by: dt

Update terminology QML project becomes Qt Quick project. Add information about creating Qt Quick applications.