/*! \page displaylib GRASS Display Library

<title>GRASS Display Library</title>

\section displayintro Display Library

<P>
Author: CERL<br>
Major rewrite: Glynn Clements

<P>
This library provides a wide assortment of higher level graphics commands which in turn use
the graphics raster library primitives. It is highly recommended that this section be used to
understand how some of the GRASS graphics commands operate. Such modules like d.vect,
d.graph, and d.rast demonstrate how these routines work together. The routines fall into four
basic sets: 1) frame creation and management, 2) coordinate conversion routines, 3) specialized
efficient raster display routines, and 4) assorted miscellaneous routines like pop-up menus
and line clipping.

Note. All routines and global variables in this library, documented or undocumented, start with
the prex D_. To avoid name conflicts, programmers should not create variables or routines in
their own modules which use this prefix.

TODO: insert ordered function list (see GRASS 5 progman)
*/