first working CLI
added feature to print family tree
extended print function
added birthdays
fixed bug in family root finder
changed CL order (#5)
added wedding date support (#12)
fixed bug when reading wedding dates from xml
can now pass birthdate and parents upon person creation
added date of passing (#8)
added divorce date support (#9)
added secondary commands
added chronology (#10)
improved print chronology
added print calendar (#11)
added event support (#3)
implemented xml saving upgrade (#14)