add numpy and PyOpenGL as optional reqs

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@36906 15284696-431f-4ddb-bdfa-cd5b030d7da7

REQUIREMENTS.html

@@ -153,6 +153,14 @@ Note: Python 3 is not supported<br>
 gui/wxpython/README)<br>
 <a href="http://www.wxpython.org">http://www.wxpython.org</a>
 
+<li><B>NumPy</B> for wxPython-based GUI tools (see
+ file gui/wxpython/README)<br>
+<a href="http://numpy.scipy.org">http://numpy.scipy.org</a>
+
+<li><B>PyOpenGL</B> for wxPython-based GUI 3D visualization (see file
+ gui/wxpython/README)<br>
+<a href="http://pyopengl.sourceforge.net">http://pyopengl.sourceforge.net</a>
+
 <li><B>FFMPEG</B> (for direct rendering of animations from NVIZ),
     including libavcodec, libavformat, libswscale <BR>
 <a href="http://ffmpeg.mplayerhq.hu/">http://ffmpeg.mplayerhq.hu</a><BR>