fix checkbox tag to match properly Bootstrap 3 visualization
A lot of changes and improvements:
- every ClosedQuestion has many ClosedAnswers but in relation OneToMany not ManyToMany (old relation ManyToMany with ClosedQuestionClosedAnswer join table is removed)
- removing facades and replacing them with BO (Business Object)
- separate Entities from view by usage of proper DTO
- splitting controllers, views and DTO to per case usage (instead of one unified DTO or Controller are now per case: New, List, Edit, Delete, Preview
- add Validate class extending Apache Validate class
- add possibility to store images for ClosedQuestion and ClosedAnswer (not implemented fully yet!)
- add UserPersonalData to store personal data of User in separate place not directly in User
- decrease CSS class project-template padding (top and bottom) from 40px to 20px
- improve packages/folders structure