/*! \page pngdriverlib GRASS GIS PNG Display Driver Library

by GRASS Development Team (http://grass.osgeo.org)

This library defines PNG Display Driver.

\section listFn List of functions

 - PNG_Driver()
 - PNG_Box()
 - PNG_Client_Close()
 - PNG_Erase()
 - PNG_Graph_close()
 - PNG_Graph_set()
 - PNG_Line_width()
 - PNG_begin_raster()
 - PNG_raster()
 - PNG_Begin()
 - PNG_Move()
 - PNG_Cont()
 - PNG_Close()
 - PNG_Stroke()
 - PNG_Fill()
 - PNG_Point()
 - PNG_Set_window()
 - PNG_color_rgb()
 - PNG_draw_bitmap()

*/