Enhancements

Miscellaneous improvements to the web server front end and implementation by @apontzen in #193
Support the combination of Ramses + AHF as halo finder by @cphyc in #178
Tests switched from nose (which is deprecated) to pytest by @apontzen in #179
Support for SQLAlchemy 2.0 by @apontzen in #174, #175
Improve "remove-duplicate" command so that it deletes all duplicates rather than just one at a time by @cphyc in #176
Improve "remove-duplicate" command so that it deletes links as well as property duplicates by @Martin-Rey in #187

Bug fixes

Avoid locking database when importing properties in a MPI session by @Martin-Rey in #181
Modernize and clean up python by @apontzen in #183 and fixed by @mtremmel in #194
Fix ID inconsistencies in AHF handler by @Martin-Rey in #191

Full Changelog: v1.5.1...v1.6.0