NEW in 3.1.0.alpha - 2021-01-10
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  * Add TrackerBatch, object made to hold multiple updates
    (in SPARQL string form, or TrackerResource) that will
    be performed atomically.
  * Add TrackerEndpointHttp, a TrackerEndpoint subclass to
    implement a (readonly) SPARQL HTTP endpoint as per
    https://www.w3.org/TR/2013/REC-sparql11-protocol-20130321/
  * Add tracker:strip-punctuation SPARQL function
  * Specify that nfo:duration is expressed in seconds
  * Fix portal initialization order
  * Improve TTL parser
  * Improve date/time parsing
  * Make handling of large series of UPDATEs iteratively
    to avoid stack size limits
  * Improve parallelization of queries
  * Optimize idempotent DELETE operations
  * Optimize insert operations
  * Optimize database resource refcount management
  * Fix tracker_notifier_signal_subscribe annotation
  * Fix possible race conditions handling ontology objects
  * Handle NULL arguments in tracker:uri-is-parent