php bugfixes + 2 workarounds for DB current state (affiliation = lab and position and affiliation can have a null placeholder)

php bugfixes + 2 workarounds for DB current state (affiliation = lab and position and affiliation can have a null placeholder)

DB settings: fine-tuning 2 (trying to remove warning InnoDB: page_cleaner: 1000ms intended loop took longer)

unify pic saving and display (pic_src) + save it as file with path in the DB + slightly refactor read_records/save_form tasks