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Thomas De Schampheleire
tests: introduce test_context to handle internationalization

As preparation to the migration to Turbogears2, introduce a test_context
context manager to wrap certain tests. The context manager provides a
translator for tests that need it. This translator was previously provided
globally to all tests via the TestController.

When swapping Pylons with Turbogears2, the new file
kallithea/tests/test_context.py can be removed, and the test_context from
tg2/tg/util/webtest.py should be used.
.. _locking:

==================
Repository locking
==================

Kallithea has a *repository locking* feature, disabled by default. When
enabled, every initial clone and every pull gives users (with write permission)
the exclusive right to do a push.

When repository locking is enabled, repositories get a ``locked`` flag.
The hg/git commands ``hg/git clone``, ``hg/git pull``,
and ``hg/git push`` influence this state:

- A ``clone`` or ``pull`` action locks the target repository
  if the user has write/admin permissions on this repository.

- Kallithea will remember the user who locked the repository so only this
  specific user can unlock the repo by performing a ``push``
  command.

- Every other command on a locked repository from this user and every command
  from any other user will result in an HTTP return code 423 (Locked).
  Additionally, the HTTP error will mention the user that locked the repository
  (e.g., “repository <repo> locked by user <user>”).

Each repository can be manually unlocked by an administrator from the
repository settings menu.