+- send menu update events only when a menu is about to be used (MSW/GTK)
+- improved event processing performance (Hans Van Leemputten)
+- added wxMirrorDC class
+- printing improvements: GetPageInfo() gets called after the DC has
+ been set and after OnPreparePrinting() has been called so it can
+ report the number of pages accurately; doesn't try to set
+ number of pages in print dialog, in common with other Windows apps;
+ wxHTML easy printing's preview shows number of pages
+ correctly; preview scrollbars are set correctly; keyboard navigation
+ improved