simplify SphericalProjection::geoCoordinates(), part 1
simplify SphericalProjection::geoCoordinates(), part 1

* multiply radius, centerX, and centerY by inverseRadius => radius becomes 1 and can be omitted
* multiply centerY by -1 => its square stays the same, qy == centerY

svn path=/trunk/KDE/kdeedu/marble/; revision=1170544

oberluz/marble,rku/marble,Earthwings/marble,quannt24/marble,tucnak/marble,Earthwings/marble,rku/marble,quannt24/marble,quannt24/marble,rku/marble,oberluz/marble,David-Gil/marble-dev,utkuaydin/marble,Earthwings/marble,probonopd/marble,utkuaydin/marble,David-Gil/marble-dev,tucnak/marble,quannt24/marble,tzapzoor/marble,oberluz/marble,tzapzoor/marble,tucnak/marble,tzapzoor/marble,adraghici/marble,quannt24/marble,quannt24/marble,Earthwings/marble,David-Gil/marble-dev,adraghici/marble,tzapzoor/marble,David-Gil/marble-dev,utkuaydin/marble,oberluz/marble,tzapzoor/marble,Earthwings/marble,probonopd/marble,utkuaydin/marble,rku/marble,AndreiDuma/marble,tucnak/marble,rku/marble,tucnak/marble,AndreiDuma/marble,rku/marble,Earthwings/marble,oberluz/marble,adraghici/marble,tzapzoor/marble,AndreiDuma/marble,utkuaydin/marble,David-Gil/marble-dev,adraghici/marble,utkuaydin/marble,probonopd/marble,tzapzoor/marble,AndreiDuma/marble,probonopd/marble,tucnak/marble,tucnak/marble,quannt24/marble,probonopd/marble,probonopd/marble,probonopd/marble,oberluz/marble,AndreiDuma/marble,AndreiDuma/marble,adraghici/marble,David-Gil/marble-dev,tzapzoor/marble,adraghici/marble