Revert "#115 User profile can not be saved"

This reverts commit 5a86f83f97f6b2e0da22a9ac15d310a32fc0eea5.

Fixed in CakePHP core, see: http://cakephp.lighthouseapp.com/projects/42648/tickets/3560-automatic-required-attribut-on-checkboxes-prevents-forms-to-be-send#ticket-3560-14

Added manually til next CakePHP release
#116 No help in search dialog