The user is now notified when an account book contains debts that can be simplified.
B: debts panel didn't span on all the available space B: when creating new expenses sheet, datebox not always synchronized with period checkbox B: anonymous expenses sheet sometimes issued a "conflict error" with no good reasons (this bug decreased also the performance) I: now possible to select expenses after the first page of expenses I: warning is displayable about the price per person (valid only if equal distribution)