reposition code and delete garbage code
added: the user can not access any section of the survey
added support to limit the max time (in minutes) to answer a survey
lack the part of user
now the right question type is selected when modifying this
check if the user can answer the survey(range of valid dates)
change validators in survey, now there are question optional
Now the researcher can't edit/delete the survey of the other researcher
update bugs and tareas