Fixed issue #8564: CSRF vulnerability in KCFinder
Dev: (QueXF) Enable splitting of single answer questions

Dev: Prevents page overflow.
Dev: Splitting is done only for questions with
Dev: many answer catergories
Fixed issue #8566: IP Spoofing
Fixed issue: Numeric-only codes on subquestions not being allowed
Fixed issue #08564: CSRF in third_party KCFinder (version 2.51)
Dev: Inserted hidden CSRF input in upload form
Fixed issue #08564: CSRF in third_party KCFinder (version 2.51)
Dev: Add a little more timeout