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- Add ``allow``-list to server stanza.
If ``keepOtherKeys`` is set to false, claviger will remove any keys present
except for those in the ``present`` and ``allow`` list.
- Add *abstract servers*. Let every server inherit from the hidden
abstract server ``$default``.
- Allow
.. code:: yaml
servers:
server1:
server2:
which is prettier than
.. code:: yaml
servers:
server1: {}
server2: {}
- bugfix: actually set server name with ``name`` option.