Refs #19076.

Thanks Gavin Wahl.

Many thanks to Alexey Boriskin, Claude Paroz and Julien Phalip.

They are simply ignored now. This allows for a more correct behavior when
they are placed before translatable constructs on the same line.

Previously, the latter were wrongly ignored because the former were
preserved when converting template code to the internal Python-syntax
form later fed to xgettext but Python has no ``/* ... */``-style
comments.

Also, special comments directed to translators are now only taken in
account when they are located at the end of a line. e.g.::

  {# Translators: ignored #}{% trans "Literal A" %}{# Translators: valid, associated with "Literal B" below #}
  {% trans "Literal B" %}

Behavior of ``{% comment %}...{% endcomment %}``tags remains unchanged.

Thanks juneih at redpill-linpro dot com for the report and Claude for
his work on the issue.

Previously, some properties weren't set unless
confirm_spatial_components_versions() was explicitely called.

Thanks sunsongxp@ for the report.

Refs #16630.

Refs #16630.

Thanks Georgy Kutsurua for the report and Simon Charette for the patch.

Thanks Simon Charette.

strptime generates an UnicodeEncodeError when using a non-ascii
unicode string on Python 2.

Thanks Evil Clay for the report and Emil Stenstrom for the initial
patch.

when a correct representation cannot be obtained.

See also BaseUserManager.normalize_email -- it uses rsplit.

Refs #4833.

Thanks jose.sanchez et ezeep.com for the report and Vladimir Ulupov
for the initial patch.

Refs #16612. Thanks Aymeric Augustin for the suggestion.

This reverts commit 2babab0b.

Thanks Stefan Koegl for the report and Simon Charette for the review.

Thanks foo@ for the report and Florian Apolloner for the review.

Also:

* Added a ``--no-startup`` option to disable this behavior. Previous
  logic to try to execute the code in charge of this funcionality was
  flawed (it only tried to do so if the user asked for ipython/bpython
  and they weren't found)
* Expand ``~`` in PYTHONSTARTUP value.

Thanks hekevintran at gmail dot com  for the report and initial patch.

Refs #3381.

Thanks charettes.

Thanks Łukasz Rekucki for the report and the patch.

Thanks will@ for the suggestion.

Remove dup_select_related method.

This undocumented method was used in an old version of the admin, is
totally untested and hails from 2008. Although it's listed in the
"public methods" section, as it's not documented or used I don't think
it needs a deprecation path.

If we think it's useful I'll write some tests/docs for it instead...