Basic start up
Visual Paradigm setup for modelling and changes to class MyConnection
(now definately works with properties file -> don't forget to store
database connection settings in connection.properties file within
persistence package)

TODO:
Make the connection.properties uri for FileInputStream relative and OS
independent. Low priority.
Huurder
major architecture changes
HuurderDAO @ Unit Tests
Most work for huurderoverview
Edit
Fix huurderedit