license from the root item if they don't have their own.
Also made the script detect the Commonwealth spelling "licence" and throw
an error with a message, rather than fail silently.

a slightly hacky special filter to control whether non-root datasets are
indexed.

and resolving items are unified. Have rejigged filtering and the filter
tests are passing. Added a test case for empty filters which let everything
through.

filters the json-ld graph based on exact and regexp matches

added a commit-to-solr runner to test catalog solr and commit to a running solr for https://code.research.uts.edu.au/eresearch/rdm/issues/912