[Boa Constr] Guide update for sizers

[Werner F. B. <wer...@fr...>]

Hi everyone,

Just committed to CVS a changed/updated first tutorial for using sizers 
in Boa (assuming Boa 0.5.x).

If anyone wants to download it (checkout from CVS), check it out, take 
it apart (but nicely please) and let me know any problems with it 
(either here or as direct mails).

Thanks in advance
Werner