Eulxml

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* Unused namespaces will now be cleaned up before serialization in
:meth:`eulxml.xmlmap.XmlObject.serialize` and
:meth:`eulxml.xmlmap.XmlObject.serializeDocument`
* :mod:`eulxml.xmlmap.eadmap` have been updated with root element names
where possible, to better support using :mod:`~eulxml.xmlmap.eadmap` to
update or modify EAD documents.

-------

* Adjust :mod:`eulxml.xmlmap` fields for better results when inspected by
sphinx autodoc or other similar tools.

-------

* Update :mod:`eulxml.xmlmap.mods` with support for id attribute on top-level MODS
element. Contributed by `bcail <https://github.com/bcail>`_.
* Update :mod:`eulxml.xmlmap.eadmap` with support for digital archival object tags.
* Add :class:`eulxml.xmlmap.fields.DateField` to support date fields
separately from :class:`eulxml.xmlmap.fields.DateTimeField`; also includes
minimal support for date fields in :class:`eulxml.forms.xmlobject.XmlObjectForm`.

-------

* Pinned MODS version to 3.4 to guard against new versions of the schema breaking validation

-------

* Corrected a minor bug where schema validation errors were not cleared between
multiple validations.
* To avoid permission denied warning for auto-generated parser files,
parsetab files are now created in python tempdir if the running user
doesn't have write permission in the package installation directory.
[`Issue 1 <https://github.com/emory-libraries/eulxml/issues/1>`_]
* When an XSLT transformation results in an empty document,
:meth:`eulxml.xmlap.XmlObject.xsl_transform` now returns None.
[`Issue 6 <https://github.com/emory-libraries/eulxml/issues/6>`_]
* Development requirements can now be installed as an optional requirement
of the eulxml package (``pip install "eulxml[dev]"``).
* Unit tests have been updated to use :mod:`nose`
* New functionality in :mod:`eulxml.xmlmap.cerp` for parsing email dates
and generating CERP xml from a Python email message object.

--------------------------------------

* :class:`eulxml.forms.xmlobject.XmlObjectForm` formsets now support
``can_order``.
* :class:`eulxml.xmlmap.fields.DateTimeField` is now included in
available :mod:`eulxml.xmlmap` fields. This replaces the previously
officially-unreleased, under-documented and -tested and misnamed
``DateField``. Date-time format handling and whitespace
normalization contributed by `jheath- <https://github.com/jheath->`_.