/*!

\page free_nodes_page Free nodes

\n This mesh quality control highlights nodes which are not connected
to any  mesh element. Free nodes are shown with a color differs from
the color of nodes.

\image html free_nodes.png
<center>In this picture some nodes don't connected to a mesh element as
a result of deleting elements and adding several isolated nodes.

<br><b>See Also</b> a sample TUI Script of a 
\ref tui_free_nodes "Free Nodes quality control" operation.  

*/