EZ_GetNumberOfAllocatedColors returns the total number of colors
allocated by EZWGL. The first 16 colors are pre-allocated and are used
internally by EZWGL for displaying 3D borders.
EZ_GetNumberOfReservedColorsForGL returns the number of colors
reserved for the graphics library. In the colormap used by EZWGL,
these reserved colors starts at index 16. For example,
if this function returns 125, the entries from 16 to 131 are reserved
for the graphics library.