* Messages.cs: Introduce new Method 'MsgRecordCannotBeDeletedDueToDependantRecordsError' to facilitate code re-use and standardisation (this Method will be called from a new screen that ChristianK is currently working on in a Branch of his, '‘Contact Categories and Types’').
* SetupAnalysisTypes.ManualCode.cs: call new Method instead of coding the code directly in the ManualCode.cs file.