add wx.Gauge

Author: amauryfa

etg/_core.py

@@ -150,7 +150,7 @@
               'checkbox',
               #'listbox',
               #'checklst',
-              #'gauge',
+              'gauge',
               'headercol',
               'headerctrl',
               'srchctrl',

etg/cffi/stream.py

@@ -53,7 +53,8 @@ def _PyInputStream_TellI(handle):
     @ffi.callback('size_t(*)(void*, size_t, int)')
     def _PyInputStream_SeekI(handle, pos, whence):
         file = ffi.from_handle(handle)
-        return file.seek(pos, whence)
+        file.seek(pos, whence)
+        return file.tell()
     clib.PyInputStream_SeekI = _PyInputStream_SeekI
     """