OpenGL version of xlayerinfo & layerdemo

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This is an OpenGL implementation of the straight-Xlib version included in src/exampleCode/X/Xservers/{xlayerinfo,layerdemo} which accompanied the prog_layers.ps article. Quoting from that dir's README:

Programming X Overlay Windows explains how to use SGI's SERVER_OVERLAY_VISUALS convention to portably create X windows in the overlay planes.

ABSTRACT: Overlay planes provide an alternate set of frame buffer bitplanes which can be preferentially displayed instead of the normal set of bitplanes. Overlay planes have been common in high-end graphics systems for some time. Recently, work has been done by Silicon Graphics to integrate overlay plane support into the X Window System. A standard convention proposed and implemented by Silicon Graphics allows X client writers to create windows in the overlay planes. This article describes how to write programs to utilize overlay planes. 
XLayerUtil.c     Sample code for routines to portably query overlay
                 visuals described in the prog_layers.ps article.

XLayerUtil.h     Acommpanying header file.

layerdemo.c      Sample code demonstrating how to use pure-X overlay
                 windows to achieve transparency effects.

xlayerinfo.c     Sample code for a program to list a server's visuals
                 including visual layering information.

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