0.0.6:
- 12/17/2017:
   - all: retrieve formula and charts(as graphic)
   - .sdw: try to retrieve more attachments.
   
0.0.5:
- 10/30/2017:
   - require C++11 for build.

0.0.4:
- 07/15/2017:
   - correct many errors detected by fuzzing
   
0.0.3:
- 02/20/2017:
   - tests if the file is created by StarImpress, if yes, converts it
     in a presentation file,
   - .sdw: try to retrieve more table's formattings and some outline levels,
   - graphics: try to retrieve more embedded pictures and the textbox
     rotations.

0.0.2:
- 08/10/2016
   - begin to convert .sdw files ; but the mark, the outline, the tables,
     the embedded shapes/pictures/... are not correctly retrieved, 
   - .sdc files : try to recover some embedded shapes/pictures/...,

   + all : try to retrieve "all" formatting in small text zones, ...
   + begin to retrieve some list, must be improved...

0.0.1:
- 01/22/2015:
   - try to retrieve cell's styles, number formatings, formula with Index and comments in .sdc files,
   - try to retrieve basic shapes and bitmap in .sda files + some formatting(but not all),
   - try to retrieve the bitmap in .sdg files,
   - add a new kind in STOFFDocument.hxx: STOFF_K_GRAPHIC to indicate that the file is a .sdg file,

   + finish to implement the StarItemPool and add functions to retrieve many
     attributes' contents,
   + update many styles classes to store only needed data,
   + correct a problem when we fail to retrieve all the texts in small EditZone
     (still with no formattings)
   + add a convertissor to create .svg files
   + correct some bugs found by afl
   
0.0.0:
- 09/29/2015: begin to reconstruct the "basic" content of sdc files, ie.
   - the sheets' names
   - the value, text or formula(if they do not contain any Index) which appear in sheet's cells
   - the column and row widths
   but not:
   - numbers' formating
   - cells' formating
   - notes, fields, embedding objects, ...