Piccolo-admin

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Fixed an issue with installing ``piccolo_admin`` in editable mode with ``pip``.

Thanks to peterschutt for reporting this issue.

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Improved the UI for error messages. Thanks to sinisaos for adding this.

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Camelcase column names could break parts of Piccolo Admin. It now works as
expected:

.. code-block:: python

class Person(Table):
This now works:
firstName = Varchar()

Even though camelcase is unusual in Python, a user may be using an existing
database, so it makes sense to support it. Thanks to sumitsharansatsangi for
reporting this issue.

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When ``piccolo_admin`` is installed, an ``admin_demo`` script is made available
on the command line, which launches a Piccolo Admin demo.

It wasn't working due to a missing folder, which has now been fixed.

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Fixed a bug with custom forms - under some situations they would fail to
render. Thanks to sinisaos for discovering this issue. See
`PR 208 <https://github.com/piccolo-orm/piccolo_admin/pull/208>`_ for more
info.

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Improved the French translations (courtesy LeMeteore).

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