Fixed #20653 -- Renamed checksetup -> check missed in [03465639]

Thanks CollinAnderson for the report.
Fixed #20740 -- GenericIPAddressField should pass protocol to formfield()

Thanks Jeff250.
Isolated host validation tests in own test case
Fixed #20582 -- Allowed default Form.label_suffix to be translated

Thanks Tim Graham for the review.
Fixed a deprecation warning in a selenium test.
Removed obsolete sentence in queries docs
Removed Python 2.6 references in GIS docs

Refs #20746.
Fixed #20681 -- Prevented teardown_databases from attempting to tear down aliases

Thanks simonpercivall.
Fixes grammatical error in auth docs

Changes "An error will be raise if you try..." to "An error will be raised if you try..."
Merge pull request #1357 from dbinetti/patch-1

Fixed grammatical error in auth docs
Fixed #20746 -- Removed Python 2.6 specific code/docs
Fixed #20625 -- Chainable Manager/QuerySet methods.

Thanks akaariai for the initial patch and charettes, mjtamlyn and timgraham
for the reviews.