NOBUG mod_surveypro: Changed the logic of tabs. Fixed the import no longer working. Added versioning to templates.

In the frame of this integration they were fixed few tons of minor issues (4700 rows of diff file).
Among them, in random order:
-> addressed copyright
-> fixed the wrong url of standard logs
-> added protected function validate_data() { from log classes where it was missing
-> syntax errors into messages
-> changed the starting default page between admin and student
-> fixed the submission table no longer filtering submission on owner names initials
-> fixed some methods intro comments
-> limited pause button only to userform with more than one page
-> added help button to opening and closing date in mod_form