BlackBerry and Android -Added ability for developer to choose OpenGL ES version ...

BlackBerry specific
-Added better documentation on required window bit depth for BlackBerry.
-Modified screen format picking so it will choose either RGBA8888 or RGB565 instead of always using RGBA8888

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1676 7f0cb862-5218-0410-a997-914c9d46530a