1. wxBitmap copy ctor and operator=() taking wxIcon added

2. wxBitmapButton focus rect looks a bit better and it respects the icon
   mask
3. wxWizard::GetPageSize() added


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4550 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/wizard.h

@@ -121,6 +121,10 @@ public:
 
     // get the current page (NULL if RunWizard() isn't running)
     virtual wxWizardPage *GetCurrentPage() const = 0;
+
+    // get the size available for the page: the wizards are not resizeable, so
+    // this size doesn't change
+    virtual wxSize GetPageSize() const = 0;
 };
 
 // include the real class declaration