Added tests for buffered streams.

Made wxBufferedOutputStream call Sync() in
    the destructor and SeekO().
  Documented this.
  Use buffered streams in wxImage. Seems to
    significantly speed-up the sample.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4847 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/typetest/typetest.h

@@ -30,6 +30,7 @@ public:
     void DoVariantDemo(wxCommandEvent& event);
     void DoByteOrderDemo(wxCommandEvent& event);
     void DoStreamDemo(wxCommandEvent& event);
+    void DoStreamDemo2(wxCommandEvent& event);
 #if wxUSE_UNICODE
     void DoUnicodeDemo(wxCommandEvent& event);
 #endif
@@ -74,6 +75,7 @@ enum
     TYPES_BYTEORDER,
     TYPES_UNICODE,
     TYPES_STREAM,
+    TYPES_STREAM2,
     TYPES_MIME
 };