Merge of "in-portal/branches/5.2.x@16121" to "in-portal/branches/5.3.x@16111".
Fixes INP-1292 - Migrate to MySQLi Driver
Fixes INP-1295 - Create IDBConnection interface
Merge of "in-portal/releases/5.2.1-B1@15627" to "in-portal/branches/5.3.x@15659".
Releasing version 'branches/5.3.x' (copy from 'branches/5.2.x') of 'in-portal' module.
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