Z3c.rml

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- Unified ``paraStyle`` and ``spanStyle`` even more.

- Extended ``<spanStyle>`` to support underline and strike as well.

- Simplified implemnetation of strike and underline style implementation. It
is also the more correct implementation.

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- Drop support for running tests using ``python setup.py test``.

- Drop Python 3.5 support.

- Extended ``<paraStyle>``:

* ``underline``: A boolean field indicating whether the entire paragraph is
underlined. The following related attributes have also been added to the
style: ``underlineColor``, ``underlineOffset``, ``underlineWidth``,
``underlineGap``, and ``underlineKind``

* ``strike``: A boolean field indicating whether the entire paragraph is
stricken. The following related attributes have also been added to the
style: ``strikeColor``, ``strikeOffset``, ``strikeWidth``,
``strikeGap``, and ``strikeKind``

* ``justifyLastLine``: Added attribute that is available in the API.

* ``justifyBreaks``: Added attribute that is available in the API.

* ``spaceShrinkage``: Added attribute that is available in the API.

* ``linkUnderline``: Added attribute that is available in the API.

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- Added missing ``lineBelowDash``, ``lineAboveDash``, ``lineLeftDash``,
``lineRightDash`` attributes

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- Fix num2words (missing import, two digit dashes)

- Added test to check what happens with text not in tags
(e.g. not in a ``<para>`` tag)

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- Add Python 3.7 Trove classifier.

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- Upgraded to support Python 3.7

- Allow ``<place>`` to contain ``<fixedSize>``, which allows content to be
fitted into the place boundaries.