bump develop version to 0.19.0-dev
new method to order xquery by a raw xpath
update django manage.py command to take optional username/password for accessing eXist [#62192324]
bugfixes: don't assume gt/lt queries should be numeric; correctly generate xqueries with multiple where filters
adjust list query filter to make it more efficient
correct link notation in changelog
update gt/lt filter tests for changes to query generation logic
set version to 0.19.0 final in prep for release