* \param elements - Elements on whose nodes to create 0D elements; if empty,
* the all mesh is treated
* \param all0DElems - returns all 0D elements found or created on nodes of \a elements
* \param elements - Elements on whose nodes to create 0D elements; if empty,
* the all mesh is treated
* \param all0DElems - returns all 0D elements found or created on nodes of \a elements