Fixed #21304 -- Typo in docs/topics/testing/advanced.txt

Thanks joao at silvaneves.org for the report.
Added 1.5.5 and 1.4.9 release notes
Fixed #21307 -- Moved TransRealMixin to django.test.utils.
Fixed E225 pep8 warnings.
Workaround admin scripts test failures on Windows+Python 3.

Change strategy used to examine instrumented output to acommodate the
fact that on Windows, where the path separator is '\', repr() of Python
modules has changed in Python 3 to use escaped backslashes in the FS
path section (e.g.
'C:\\python3x\\Lib\\site-packages\\django\\contrib\\auth\\models.py')
without having to special-case based on platform.
Fixed #13245: Explained Oracle's behavior w.r.t db_table
and how to prevent table-name truncation

Thanks russellm & timo for discussion, and timo for review.
Fixed #21298 -- Fixed E301 pep8 warnings
typo on 1.7 release notes
Merge pull request #1801 from collinanderson/patch-10

typo in 1.7 release notes
Fixed #12027 -- Fixed EmailValidator to reject a trailing dot.

Thanks Klas H for the report and claudep for the patch.
Fix migration planner to fully understand squashed migrations. And test.
Fixed #19941 -- Removed sys.path hack when running the test suite.

Thanks jezdez for the suggestion.
Bumped release date for 1.5.5 & 1.4.9.
Fixed #20945 -- Allowed cache tag to use a specific cache.
Added missing newline in docstring; refs #20945.
Start attacking E231 violations
Fixed #21299 - Changed filters from title to capfirst on admin inline formsets.

Previously there was a mixture of the two which resulted in inconsistent
casing.
Fixed #21227 -- Added workaround for selenium test failures

Added a refresh() before quit() in the selenium tests, since this
solves the problem of spurious test failures in some environments.
Fixed #20338 -- Stripped ending dot during host validation

Thanks manfre for the report and Timo Graham for the review.
Fixed #21219 -- Added a way to set different permission for static files.

Previously, when collecting static files, the files would receive permission
from FILE_UPLOAD_PERMISSIONS. Now, there's an option to give different
permission from uploaded files permission by subclassing any of the static
files storage classes and setting the file_permissions_mode parameter.

Thanks dblack at atlassian.com for the suggestion.