+- wxTaskBarIcon objects must now be destroyed before the application can exit.
+ Previously, the application terminated if there were no top level windows;
+ now it terminates if there are no top level windows or taskbar icons left.
+- wxZlibInputStream is not by default compatible with the output of the
+ 2.4.x version of wxZlibOutputStream. However, there is a compatibilty mode,
+ switched on by passing wxZLIB_24COMPATIBLE to the constructor.
+- when WXWIN_COMPATIBILITY_2_4 == 0 wxHashTable uses a new implementation
+ not using wxList keyed interface (the same used when wxUSE_STL == 1),
+ the only incompatibility being that Next() returns a wxHashTable::Node*
+ instead of a wxNode*.
+- non-const wxDC methods GetBackground(), GetBrush(), GetFont() and GetPen()
+ don't exist any more, please fix your code -- it never worked correctly
+ anyhow if you modified the objects returned by these methods so you should
+ simply switch to using const methods.
+
+wxTaskBarIcon must be explicitly destroyed now, otherwise the application
+ won't exit even though there are no top level windows