Handle non "points" fontunits properties (bug # 40158) * graphics.in.h (axes and text properties): new hidden, read-only properties "fontsize_points" * graphics.in.h (text properties): declare custom set/update methods for "fontunits" property * graphics.cc (text::properties::set_fontunits, text::properties::update_fontunits): new methods borrowed from axes::properties * graphics.cc (text::properties::update_font, axes::properties::update_font): use new property "fontsize_points" * gl-render.cc (opengl_renderer::set_font): use new property "fontsize_points" * gl-render.cc (opengl_renderer::draw_text): call set_font * gl2ps-renderer.cc (glps_renderer::set_font): use new property "fontsize_points"

--- a/libinterp/corefcn/gl2ps-renderer.cc
+++ b/libinterp/corefcn/gl2ps-renderer.cc
@@ -182,7 +182,7 @@
 {
   opengl_renderer::set_font (props);
 
-  fontsize = props.get ("fontsize").double_value ();
+  fontsize = props.get ("fontsize_points").double_value ();
 
   caseless_str fn = props.get ("fontname").string_value ();
   fontname = "";