Clipping range has been moved from SelectMgr_RectangularFrustum to SelectMgr_SelectingVolumeManager
and passed to frustum as an argument to Overlap() methods.
This fixes an issue when Clipping is customized per-object within SelectMgr_ViewerSelector::traverseObject()
in case when shallow copy of SelectMgr_SelectingVolumeManager is created
(frustums are copied from global frustum manager by Handle).
