#13 Support django 1.8

https://www.illyse.org/issues/236

django-autocomplete-light supports Django 1.8 starting from version 2.1.1: https://github.com/yourlabs/django-autocomplete-light/blob/master/CHANGELOG

Version 2.2.X seems to introduce quite a lot of (possibly non-compatible) changes, so keep that for later.

django-netfields supports Django 1.8 from version 0.3.1: https://github.com/jimfunk/django-postgresql-netfields/blob/master/CHANGELOG

Versions 0.4+ seem to introduce some API changes, so keep that for later.

Django-polymorphic should be updated to 0.7.2: https://django-polymorphic.readthedocs.org/en/latest/changelog.html

Django-sendfile should be updated to 0.3.10: https://github.com/johnsensible/django-sendfile/commits/master

Django-ldapdb should be upgraded to 0.4.0: https://github.com/jlaine/django-ldapdb/issues/79

Changes in Django itself that could affect us:

• https://docs.djangoproject.com/en/1.8/releases/1.8/#default-emailfield-max-length-increased-to-254
• https://docs.djangoproject.com/en/1.8/releases/1.8/#related-object-operations-are-run-in-a-transaction
• https://docs.djangoproject.com/en/1.8/releases/1.8/#abstractuser-last-login-allows-null-values

There is an issue with Django 1.8.7, when applying migrations from an empty database (traceback below).

It seems related to an existing migration, in which we moved the "comment" field from VPNConfiguration to Configuration. See coin/configuration/migrations/0003_configuration_comment.py and coin/vpn/migrations/0002_remove_vpnconfiguration_comment.py.

Relevant Django bug report: https://code.djangoproject.com/ticket/21890

$ ./manage.py migrate
Operations to perform:
  Synchronize unmigrated apps: coin, staticfiles, messages, autocomplete_light, activelink, ldapdb, polymorphic
  Apply all migrations: simple_dsl, vpn, billing, sessions, admin, sites, auth, reverse_dns, contenttypes, offers, isp_database, members, configuration, resources
Synchronizing apps without migrations:
  Creating tables...
    Running deferred SQL...
  Installing custom SQL...
Running migrations:
  Rendering model states...Traceback (most recent call last):
  File "./manage.py", line 10, in 
    execute_from_command_line(sys.argv)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
    utility.execute()
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/core/management/__init__.py", line 346, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/core/management/base.py", line 394, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/core/management/base.py", line 445, in execute
    output = self.handle(*args, **options)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 222, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/migrations/executor.py", line 104, in migrate
    state = migration.mutate_state(state, preserve=do_run)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/migrations/migration.py", line 83, in mutate_state
    operation.state_forwards(self.app_label, new_state)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/migrations/operations/models.py", line 53, in state_forwards
    list(self.managers),
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/migrations/state.py", line 81, in add_model
    self.reload_model(app_label, model_name)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/migrations/state.py", line 152, in reload_model
    self.apps.render_multiple(states_to_be_rendered)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/migrations/state.py", line 262, in render_multiple
    model.render(self)
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/migrations/state.py", line 546, in render
    body,
  File "/home/zorun/tmp/venv2-coin/lib/python2.7/site-packages/django/db/models/base.py", line 254, in __new__
    'base class %r' % (field.name, name, base.__name__)
django.core.exceptions.FieldError: Local field u'comment' in class 'VPNConfiguration' clashes with field of similar name from base class 'Configuration'

With Django 1.7.11, the same situation (applying all migrations on an empty database) works fine.

Django 1.7 is no longer supported since December 2015: https://www.djangoproject.com/download/#supported-versions