in sequenceSections now return  id of section instead of "section"
moreover I check if empty Section (empty = no description, no questions),
if empty section, not put it in the list return
This last verification have been removed of nextSection
added: save dateTime when the user finish survey
added: save ip of user when start survey
added: storage the time spent in a section by an user
update bugs, tareas & cosicas
Reposition code