new POJO Appointment
new Series POJO
new Appointment + Series JPA Entities
removed Slot using methods from application
datepicker in addappointment view + formback modifications
Datepicker working
added support for serving files for pretty-frontend stuff
ugly time and date input working
changed form-dependent javascript
alter RoomService Interface to Date-based
broaden interface of AppointmentService
change AppointmentDAO interface
outsourced date util into new util package
ajax getOptions request is delivered correctly
jpa reads now working
remove non-default constructor since auto id generation does not work this way!
adding appointments (withoud collision checking) is working
reference instead of id
    reference instead of id
between two dates queries seem to work properly