+ add support for presentation file (i.e. the file created will StarImpress
     are now open as presentation).
  + modify the OLE parser to be similar to the librevenge OLE parser,
    ie. the librevenge parser ignores the first character of a filename if
    this is a control character...

Change-Id: I913a70cba29839d43dac58d5e00dbebfc4d28abc