merge init-element-branch -> trunk

m4/opengl.m4

+dnl
+dnl check for OpenGL (tm)
+dnl 
+AC_DEFUN([ALBERTA_OPENGL_CHECK],
+[AC_REQUIRE([AC_PATH_X])
+AC_REQUIRE([AC_PATH_XTRA])
+ALBERTA_CHECK_PACKAGE([OpenGL],[GL],[${x_libraries}],[${X_LIBS} -lX11],
+                      [gl.h],[${x_includes}/GL -I/usr/include/GL],[${X_CFLAGS}],
+                      [optional])
+])
+