Fix return of types of create 'analyses' and 'model' POST in API spec.

[sambles]

Issue Description

The enchantment #1067 allows settings JSON to be added when creating either an /analyses/ or /model/ to support this the serializers have been split between:
"Read Only" ['AnalysisList', 'AnalsysisModelList'], and "Writeable" ['Analysis', 'AnalsysisModel']

When sending POST request create new objects the 'Writeable' objects are called which have a 'settings: ' section.

Problem: The return from this request is also Analysis or AnalsysisModel which is incorrect. It should be the read-only serializers.

Also check and fix that AnalysisModelList has its list of data file ids (like with AnalysisModel)

[sambles]

create an RC version for testing when ready