Honor the axes stack order in gl2ps outputs (bug #44765) * gl2ps-renderer.h (glps_renderer::draw_axes): new method to init a new sorting tree in gl2ps each time a new axes is drawn before calling opengl_renderer::draw_axes. * gl-render.cc (opengl_renderer::draw_axes_planes): don't draw xz and yz planes when in 2D mode.

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