Fixed Remove usage of deprecated ::redirect (issue #542)
Refactor: removed legacy upgrade script that is no longer supported
Refactor: removed debugging code
Fixed Does not protect against clickjacking (issue #540)
Merge branch 'develop' into bugfix/542-deprecated-redirects

Conflicts:
	www/previewfile.php
Merge branch 'develop' into bugfix/540-clickjacking-protection

Conflicts:
	www/previewfile.php
Merge pull request #538 from janus-ssp/bugfix/536-create-entities-fail

[REVIEW] Creating an entity triggers a silent error (issue #536)
Merge pull request #543 from janus-ssp/bugfix/542-deprecated-redirects

[REVIEW] Remove usage of deprecated ::redirect (issue #542)
Merge pull request #541 from janus-ssp/bugfix/540-clickjacking-protection

[REVIEW] Bugfix/540 clickjacking protection
Merge branch 'develop' into bugfix/536-create-entities-fail