Made wxStubs compile on Unix.

Improvements to doc/view on MDI, including multiple menus for wxFileHistory.
Added wxDirExists to wxMSW; moved wxMatchWild to filefn.cpp


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@740 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/control.h

@@ -28,7 +28,7 @@ public:
    wxControl(void);
    ~wxControl(void);
 
-   virtual void Command(wxCommandEvent& WXUNUSED(event)) = 0;        // Simulates an event
+   virtual void Command(wxCommandEvent& WXUNUSED(event)) {};        // Simulates an event
    virtual void ProcessCommand(wxCommandEvent& event); // Calls the callback and
                                                                  // appropriate event handlers
    virtual void SetClientSize(int width, int height);