Replaced GtkRuler with GimpRuler because GtkRuler was removed from GTK 3.
* glom/utility_widgets/gimpruler/: Added several source files from gimp, with small changes to make it build for us, to provide the GimpRuler widget. * COPYING: Switch to GPL version 3 (instead of 2), because the GIMP source code uses it. * Makefile_glom.am: * glom/glom_developer.glade: * glom/mode_design/print_layouts/window_print_layout_edit.[cc|cc]: Use GimpRuler instead of GtkRuler, creating and adding them in code instead of in the .glade file, to avoid Glade needing to know about that widget.
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