Complete transfer of usable method declarations in imaggif.h

and fix a typo in imagtiff.h

interface/wx/imaggif.h

@@ -45,11 +45,20 @@ public:
                         bool verbose = true, int delayMilliSecs = 1000);
 
 protected:
+    // allow parent class documentation to overwrite.
     virtual int DoGetImageCount(wxInputStream& stream);
     virtual bool DoCanRead(wxInputStream& stream);
 
+    // TODO: document these as necessary
     bool DoSaveFile(const wxImage&, wxOutputStream *, bool verbose,
         bool first, int delayMilliSecs, bool loop,
         const wxRGB *pal, int palCount,
         int mask_index);
+    bool InitHashTable();
+    void ClearHashTable();
+    void InsertHashTable(unsigned long key, int code);
+    int  ExistsHashTable(unsigned long key);
+    bool CompressOutput(wxOutputStream *, int code);
+    bool SetupCompress(wxOutputStream *, int bpp);
+    bool CompressLine(wxOutputStream *, const wxUint8 *line, int lineLen);
 };