- giant class flag moved from attributes to card-notes

- giant class flag moved from attributes to card-notes
- merger only marks documents by giant flag and
  the penalization is done in chewer
- added new weight attribute to cards: Wp means weight after penalization
  added penalization notes in the form .Pg-50 (giant class penalized by -50)
- chewer.c: card_write_start() does NOT write struct card_attr and it needs
  to be done manually later
- chewer.c: weight records are sorted chronologically, I like it more :-)