Listing to json conversion

I think this is ready to go now.
 - agreed with Tony R which security questions need to be converted to 'choose as many as apply' fields instead of 'choose one'
 - Dates now in standard format for validation at the API
 - Updated version number for post-switch-off releases
The ARRAYS_OF_STRING in the SSP have already been converted to JSON in the page controller before being saved, so calling toJSON() on them again results in doubly escaped quotes.