Merge tag '1.3.9' into develop

Release: 1.3.9
Preparation for new development cycle after release 1.3.9
Don't use superglobals.
Don't use superglobals
Don't use superglobals
Don't use superglobals
Don't use superglobals
Don't use superglobals
Can't use function return value in write context
The ) is in the wrong spot.
Don't use superglobals
Add changes to log
Version bump 1.4.0-dev.12
Merge branch 'feature/use_request_class' into develop
Uploading/Deleting an entry fails.

Uploading and then deleting an competition entry fails
Remove str_replace

All entries in the database have been converted to a relative path. We no longer need to remove the old directory name.
Fix certain database calls

Some calls overdid the return
Fix request check for empty fields
Output error message from the Request class
Objective all DB entries