Logging in debug and release builds

[Armel Asselin]

>    inline void wxVLogDebug(const wxChar *, va_list) { }
>    inline void wxLogDebug(const wxChar *, ...) { }
>    inline void wxVLogTrace(wxTraceMask, const wxChar *, va_list) { }
>    inline void wxLogTrace(wxTraceMask, const wxChar *, ...) { }
>    inline void wxVLogTrace(const wxChar *, const wxChar *, va_list) { }
>    inline void wxLogTrace(const wxChar *, const wxChar *, ...) { }

just as a note, such functions are really not at all like empty macro 
definitions because their _arguments_ will be evaluted, even in release 
build, and unless these arguments are inlined and/or trivial they won't be 
optimized out.

Armel