Add support for Solr 6.1.0. Update dev deployment, documentation.
- [DH] Changes
- [DH] conf/solr/lui-solr.in.sh
- [DH] dev-deploy.yml
- [DH] dev-install.sh
- [DH] dist/install_solr6_service.sh
- [DH] dist/solr-6.1.0.tgz
- [DH] doc/apache-solr-ref-guide-6.1.pdf
- [DH] doc/debian-install.md
- [DH] doc/dev-install.md
- [DH] doc/upgrade.md