Also, some test refactoring and add servant-client to tests.

This reverts commit efbe327f, reversing
changes made to 6d9bcd07.

We have contexts.hash_id which is enough (computed by postgres as a
trigger).

Merge remote-tracking branch 'origin/314-node-phylo-change-the-default-value-of-findancestors-to-false' into dev

We use for now an initial translation into Haskell of
this Javascript implementation:

https://github.com/words/lancaster-stemmer/blob/main/index.js

More tests needed

Test failed, not merging.

This reverts commit 2e77bfa5, reversing
changes made to fe201115.