Django-extensions

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Changes:

- Improvement: runserver_plus, gh 1575 survive syntax and configuration errors
- Improvement: runscript, use exit-code 1 if script is not found

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Changes:

- Improvement: runscript, add --continue-on-error unless set runscript will exit on errors
- Improvement: runscript, allow to return exit-code
- Improvement: runscript, support raise CommandError(... returncode=...)
- Improvement: runscript, run Django checks() and check_migrations() before executing scripts
- Improvement: shell_plus, set application name on all postgresql backends

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Changes:

- Fix: runserver_plus, exceptions must derive from BaseException error

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Changes:

- Various cleanups
- Deprecated using `--router` instead use `--database`
- Locales: Indonesian and Polish, updated
- Improvement: show_dsn, fix crash with django-postgres-extra
- Improvement: print_settings, added wildcard support
- Improvement: print_settings, added --fail option
- Improvement: delete_squashed_migrations, add --database option
- Improvement: runserver_plus, added RUNSERVER_PLUS_EXTRA_FILES setting
- Improvement: runserver_plus, added runserver_plus_started signal

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Changes:

- New: InternalIPS, allows to specify CIDRs for INTERNAL_IPS
- Docs: restructure toctree

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Changes:

- Fix: shell_plus, fix honouring SHELL_PLUS in settings.py