Fixed #6103 -- Splitted tests in model_forms tests
Merged model_forms_regress with model_forms tests
Fixed #22272 -- Fixed regression in DecimalField when using decimal_places=0.

Thanks to trac user merb for the report.
Changed start of week for Australia to Sunday as requested in https://code.djangoproject.com/ticket/21989
Fixed #22001 -- Ensure db_type is respected.

db_parameters should respect an already existing db_type method and
return that as its type string. In particular, this was causing some
fields from gis to not be generated.

Thanks to @bigsassy and @blueyed for their work on the patch.

Also fixed #22260
Merge pull request #2430 from NathanRSmith/ticket_21989

Fixed #21989 - Modified first day of week in AU locale.

Although Australia is a signatory to ISO 8601, there's a lot of evidence to suggest that this is in the same category as "officially, the USA uses metric". See the ticket for supporting details.