Collective.solr

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- Fix index subjects with non-ascii characters. [mathias.leimgruber]

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- Use named behavior "solr.fields" instead of "collective.solr.behaviors.ISolrFields".
[timo]

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- Remove superfluous for attribute on "Solr extension" behavior registration.
[timo]

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Bugfixes:

- Add "Plone 5.2" and "Python 3.7" classifiers to setup.py.
[timo]

- Replace log.warn with log.warning to avoid deprecation messages.
[timo]

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Bugfixes:

- Remove ZODB and Zope2 from depenencies in setup.py. This breaks collective.recipe.plonesite in Plone 5.
[timo]

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New Features:

- Plone 5.2 compatibility.
[jnns, reinhardt, csenger, timo]

- Python 3 compatibility.
[jnns, reinhardt]

- Solr 8 compatibility.
[timo]

- Add geospatial search filters.
[timo, csenger]

Bugfixes:

- Don't use collective.indexing if Plone>=5.1, Products.CMFCore provides all its functionality.
[jnns]

- Revert "Index comments" from 7.0.0a2 release.
[timo]