Ftw-solr

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

- Add option to synchronize Solr with catalog in maintenance view.
[buchi]

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

- Set Content-Type 'application/x-www-form-urlencoded' for requests to
/update/extract endpoint to ensure compatibility with Solr 7.3.
[lgraf]

- Maintenance view: Allow reindexing without dooming the transaction.
[lgraf]

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

- Make sure we do not pass invalid dates to Solr.
[buchi]

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

- Declare dependency on plone.namedfile[blobs].
[lgraf]

- Add diff function to maintenance view to compare UIDs in portal catalog with
UIDs in Solr.
[buchi]

- Fix security filter: Properly quote roles/users with spaces.
[buchi]

- Add option to reindex Solr from a catalog query.
[buchi]

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

- Complete rewrite. Not compatible with previous versions.
[buchi]