Updated application to:
   left mouse click add vertex
   right mouse click: select vertex.
               If mouse is not pointing at a vertex, selecton list is cleared.
   shift right mouse click: add vertex to selection.
               If vertex is already selected, vertex is removed from selection list.
               Known bug: If shift click is not on a vertex, the list is cleared.
   'DELETE; key : delete vertices in the selection list. (clears selection list when finished).
   mouse position in circle of vertex: blue highlight if vertex has not been selected,
                                       yellow if vertex has been selected.

   converted floating point values:
             eyeX...eyeZ to PVecor eye.
             atX...atZ   to PVector at.
             mX...mZ     to PVector mouseUV.
             upX..upZ    to PVector Up.
Forced upload of changed files