#746470 by follow-up by aspilicious, Jacine, jbrown, sgabe, et al: Add border-radius for IE9 / Opera 10.50

#655416 by casey, yoroy, BTMash, Bojhan, Gábor Hojtsy, sun, ksenzee, oseldman, jrguitar21, et al: 'Demonstrate block preview' should not open in the overlay, and should reflect the regions in the front-end theme.

#181741 by quicksketch: fix AHAH throbber/progress bar issues and generalize progress display configuration to allow module developers to choose from the throbber and progress bar

#157752 by quicksketch: extend AHAH functionality to most types of form elements, without writing JavaScript. Also AHAH enable the blocks admin page.

#145737 by yhager, documentation cleaned up by myself: add support for RTL CSS overrides and default RTL CSS override files for modules
Note: properties, which are different in the RTL display are marked with /* LTR */ in default CSS files now,
so maintainers remember that changing them should also have an effect on RTL CSS files.

This should open the way for better RTL (right-to-left written) language (such as Arabic and Hebrew) support.