Plonetheme.barceloneta

Fixes:

- Fixed some css rules (missing clearfixes, aligning thumbs, ...).
<https://github.com/plone/plonetheme.barceloneta/issues/62>
[fgrcon]
- Added css-rules for thumbnails in listings and portlets. Related to
[1226](https://github.com/plone/Products.CMFPlone/issues/1226).
[fgrcon]
- Underline links in content-core (criterion 1.4.1). [polyester]
- Increased contrast, eliminated contrast-checker false positives.
[polyester]
- Title under thumb in albumview (closes
[1091](https://github.com/plone/Products.CMFPlone/issues/1091)).
[polyester]
- Don't include diazo bundle in backend theme. [instification]
- Discard duplicated ids for columns (closes
[1105](https://github.com/plone/Products.CMFPlone/issues/1105))
[davilima6]
- Add comment to alert on duplicate resource registering [davilima6]

- Fix in barceloneta word wrap in event listing. [sneridagh]

- Add spaces between checks and labels in search filter (closes
[982](https://github.com/plone/Products.CMFPlone/issues/982)).
[rodfersou]
- Center buttons on ordered selection lists (closes
[1017](https://github.com/plone/Products.CMFPlone/issues/1017)).
[rodfersou]
- Center checkboxes on user/group matrix (closes
[1003](https://github.com/plone/Products.CMFPlone/issues/1003)).
[rodfersou]
- Remove hero-element from index.html. Instead include a view hero.
Fixes <https://github.com/plone/Products.CMFPlone/issues/974>
[pbauer]
- Harmonize plone.app.discussion styles and discussion.plone.less
styles refs (refs
[764](https://github.com/plone/Products.CMFPlone/issues/764))
[ichim-david]
- Fix display of date widget arrows and footer buttons (refs
[891](https://github.com/plone/Products.CMFPlone/issues/891)).
[ichim-david]
- Clean Gruntfile.js, package.json and HOWTO_DEVELOP.rst of grunt
plugins and information which this package no longer uses since
commit 9f5434 [ichim-david]
- provide basic table styles [vangheem]
- Fixed (refs
[979](https://github.com/plone/Products.CMFPlone/issues/979) and
[981](https://github.com/plone/Products.CMFPlone/issues/981))
related to text not wrapping when unusual (and artificial) text with
no white-space exists in the page [sneridagh]
- Fixed styling problems when figcaption is very long [sneridagh]
- Renamed the news.plone.less into behaviors.plone.less as it no
longer make sense [sneridagh]

- Fix display of album_view title links (closes
[911](https://github.com/plone/Products.CMFPlone/issues/911)).
[ichim-david]

- Bring back document byline (closes
[741](https://github.com/plone/Products.CMFPlone/issues/741)).
[rodfersou]
- Prefer rules with CSS selectors over XPath whenever possible
[davilima6]

- Add a pared down version of barceloneta to include in your theme to
save you making a custom backend theme. [djay]