Fixes #0000779: Upgrade from 4.3.9 to 5.1.0-RC1 of In-Portal fails
Fixes #0000630: Move Config.php and Debug.php from root to system/ folder
Merge of "in-portal/releases/5.0.2@13073" to "in-portal/branches/5.1.x@12657".
Reintegrate merge of "in-portal/releases/5.0.1@12617" to "in-portal/branches/5.1.x@12453".
Releasing version 'branches/5.1.x' (copy from 'branches/RC')
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