Datacube-ows

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* Includes support for user-defined band math (for colour ramp styles with matplotlib colour ramps). This is
an experimental non-standard WMS extension that extends the WMS GetCapabilities document in the standard
manner. The output validates against an XSD which is a valid extension of the WMS GetCapabilities schema.
Backwards compatible extensions to GetMap allow the feature to be called by client software (562, 563).
* If all goes to plan this will be the first OWS release automatically pushed to PyPI
(560, 568, 369, 570, 571, 572, 573, 574, 575, 576).
* Multi-product masking bug fix (567). This was a serious bug affecting most multi-product masking use cases.
* Documentation updates (561, 564)
* Version number increment to 1.8.7 (577)

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* Enhanced documentation (including HOWTO Styling Guide). (545, 551, 554, 555, 558)
* Stricter linting (549, 550, 552, 557)
* Minor improvements to extent masking (546)
* Miscellaneous bug fixes (553, 556)

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First release to
PyPI: `https://pypi.org/project/datacube-ows/1.8.5/ <https://pypi.org/project/datacube-ows/1.8.5/>`_

* Date delta can now control subtraction direction from config (535)
* New helper functions in standalone API (538)
* Bug fixes in standalone API. (542, 543)
* First draft of new "HOWTO" Styling guide. (540, 543)
* Miscellaneous cleanup. (533, 534, 537, 541)
* Prep for PyPI (544)

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* Standalone API for OWS styling. (523)
* Support for enumeration type bands in colour-map styles. (529)
* Numerous bugfixes.
* Updated documentation.

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* Generalised handling of WMTS tile matrix sets (452)
* Progressive cache control headers (476)
* Support for multi-product masking flags. (499)
* Greatly improved test coverage (various)
* Many bug-fixes, documentation updates and minor enhancements (various)

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* Config inheritance for layers and styles.
* CRS aliases
* Enhanced band util functions.
* Query stats parameter.
* Stand-alone config parsing/validating tool.
* Cleaner internal APIs, improved test coverage, and bug fixes.