Add /reconcile endpoint in addition to /suggest

[nichtich]

Basically it's the same as /suggest but via Reconciliation API, so we can list our API endpoints at https://reconciliation-api.github.io/testbench/. In addition to mapping Reconciliation API's query parameter, JSKOS server needs to publish a Service Manifest if no query parameter was given.

• GET /reconcile return general service manifest

• GET /reconcile?voc={URI} return general service manifest for selected vocabulary

• GET /reconcile?voc={URI}&query={query} return concept suggestions but in Reconciliation API response format

The response format could also be returned at /suggest endpoint with format=reconcile.

[nichtich]

This had not been prioritized because the use case is currently not required by VZG but it would be a very useful feature for other vocabulary users. Probably most of the work is documentation but there are good tutorials e.g. for OpenRefine.