gp_Trsf::SetRotationPart() - added method replacing rotation matrix without reseting other components,
similar to existing SetTraslationPart() and SetScaleFactor().
Transformation multiplication order has been fixed
for vlocation arguments -rotate, -translate, -mirror and -scale.
Added -prerotate, -pretranslate, -premirror and -prescale options following previous behavior.
vlocation -setRotation now uses new method gp_Trsf::SetRotationPart()
for consistency with methods -setLocation and -setScale.
