Index isPartOf as a parent relationship
Ensure lang-specific access points are copied to the generic field
Don't optimize on commit, since it's apparently not needed now and slows deletes
First attempt at setting up a usable test harness for Solr search functionality.

* Abstract test class `AbstractSolrTest` is based on `SolrTestCaseJ4`
* Configuration in `solr/conf` should mirror that in production
* Json path asserts used for testing Solr JSON responses
* A couple of basic query and spellcheck tests in place
Whoops, went a bit high on the Lucene version for the prod servers (will update ASAP)
Make the query helper a bit more flexible by allowing extra params
Create a README for the Solr test/config dir.
Pom cleanup
Merge https://github.com/mikesname/ehri-indexer

Conflicts:
	solr/conf/schema.xml
trying