Plone-portlet-static

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Bug fixes:

- Remove unittest2 dependency
[kakshay21]

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New:

- Attempt to use AutoExtensibleForm for as base for static portlet forms
when Plone 4 site also has recent plone.app.widgets; this should be
consistent in portlet with how TinyMCE is configured for Dexterity
content. This approach attempts to harmonize Plone 4 compatibillity
work done previously by thet and cdw9 -- supporting Plone 4, either
with/without plone.app.widgets, and with/without plone.app.contenttypes
(provided recent plone.app.widgets is used).
[seanupton]

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Fixes:

- Cleaned up test setup.
[timo]

- Check that renderer has a '__portlet_metadata__' attribute
and compute 'assignment context' only for 'context' portlet.
[sverbois]

- Plone 4 compatibility.
[thet]

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- Replace DL/DT/DD in portlet with more semantic markup (see PR 7).
[khink]

- Fix the relative url transformation.
The 'safe_html' transformation has to be called with 'assignment context'
instead of 'display context'.
[sverbois]

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- Use z3c.form for the portlet forms.
[bosim, davisagli]

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- Check if instance is str before turning to unicode as Portal_tranform itself
can return unicode
[fafhrd91]

- Portlet title no longer required. If the title is empty, the css class
"titleless" is added to the header.
[rnix, thet]

- Adding constraint to validate white spaces
Fix https://dev.plone.org/ticket/13130
[hersonrodrigues]

- Add MANIFEST.in.
[WouterVH]

- Add metadata.xml to profile.
[WouterVH]