Thanks knowledgepoint-devs for the suggestion.

Thanks Sam Hartsfield for the report.

Migrations respected Field.db_parameters()['check'], but
DatabaseCreation was still using just Field.db_type().

Thanks Tim for the review.

Thanks djbaldey for the report.

Thanks zachborboa for the report and blackguest for the patch.

Prevent possible recursion limit issue in migration planning

Thanks jaap3 for the report.

There are no supported versions that use the old layout (<=1.3).

This reverts commit 66757fee.
Discussions have led to think that this functionality does not
bring significant benefits to justify the added complexity.
Read also discussions on ticket #22734.

refs #23395.

Complete rework of translating data values from database

Deprecation of SubfieldBase, removal of resolve_columns and
convert_values in favour of a more general converter based approach and
public API Field.from_db_value(). Now works seamlessly with aggregation,
.values() and raw queries.

Thanks to akaariai in particular for extensive advice and inspiration,
also to shaib, manfre and timograham for their reviews.

Allows easier customization of policies regarding which users are allowed to
reset their password.

Thanks Aymeric for review.