Collective.fhirpath

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Breakings

- As a part of supporting latest ``fhirpath`` version (from ``0.6.1``), drop python version later than ``3.7.0``.

- ``ElasticsearchEngineFactory.__call__``'s argument name ``fhir_version`` changed to ``fhir_release``.

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Improvements

- ZCatalog featured fhir search added, from which you will get ZCatalog´s brain feature.

- ``FhirFieldIndex`` named PluginIndex is now available.

- FHIR ``STU3``and ``R4`` search mapping is now available.

- Others improvements that make able to use in production project (of course without guarantee.)

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- first working versions, with lots of improvements.

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- Initial release.
[nazrulworld]