Ingestion performance improvements

v2.3.0-20210630

Merge branch 'master' of https://github.com/ge-semtk/semtk

minor fixes

Correct invalid nodegroup object property when both domain and range are incorrect.
More cleanly handle model object properties with range like this in sadl "with values of type { A or B } "

Ingest more robust to Fuseki et. al. going down and back up

Retry anything from connection errors.
Retry during upload turtle from cache during ingest.

Improved performance ingest w/ URI-lookup

removed unused bindings from URI lookup queries
SPARQLgraph warns against baseURI that doesn't start with "http://"

Repair invalid nodegroups

Functionality to repair nodegroups that are not valid to the model.

Note nodegroups will not be backwards compatible to old versions of SemTK.
(old nodegroups are always forward compatible with new software)

Connection pooling

Improves performance and avoids some catastrophic failures caused by using all the connections during a large ingest job with URILookup.

Bug fix for RACK release

Fixed nodegroup validation bug "wasInformedBy range of ACTIVITY does not match model range of THING"

For RACK release

Minor updates for the RACK release

Serious SPARQLgraph bug fix

Important fix to v2.3.0-20210415
SPARQLgraph had been destabilized.

Allow ingest that generates no date

RACK issue #345