+ tPersons table: added the link to the father and mother
+ new tPersonsGroups and tPersonsGroupsPersons tables to be able to define groups of people like "Friends","Family","Sport team", etc.
+ new tPlaces table
+ New tHumanContacts, tHumanContactsPersons and tHumanContactsPlaces tables to keep track of contacts between people
+ tSettings table: added the DeleteHumanContactsAfterDays field
+ tPatients table: added the PregnantSince field