Open Data Cube 1.9.0

Open Data Cube 1.9.0 release

1.9.0 is first major release of the Open Data Cube in several years. The focus has been on retiring technical
debt and unused features and preparing for major architectural changes in subsequent releases.

As there are some backwards incompatibilities in this release, we recommend that you read the migration notes
at docs/installation/MIGRATION-1.8-to-1.9 before upgrading.

Major changes from recent 1.8.x releases include:

• A new index driver that uses PostGIS spatial indexes to provide faster and more accurate geospatial search
  and provide better support for storing data that covers regions where traditional lat/long seach is
  inadequate (i.e. covering polar regions or crossing the anti-meridian).

  The new postgis index driver implements a new API for working with dataset lineage, and only supports
  a single location per dataset. It is otherwise largely backwards compatible with the legacy postgres index driver.

  The legacy "postgres" index driver is still available, but will be removed in a future release.

• A new configuration layer that provides more predictable and consistent behaviour and will be easier to
  extend in future.

  Given the nature and scope of the changes, the new configuration layer is not fully backwards compatible
  with the old implementation, but the vast majority of use cases should only require minor adjustments
  to existing configuration and code at most.

• The old datacube.utils.geometry library is now deprecated. odc-geo is used internally throughout,
  and we recommend updating all your code to use odc-geo rather than the deprecated internal library.

• The long-deprecated executor and ingestion workflows have been removed.

Changes since 1.9.0-rc13

• API autodocs cleanup (#1688)
• Further metadata fix for new lineage API (#1690)
• Update release process ready for post-1.9.0 release (#1691)
• Removed all references to the postgis driver as "experimental" in tests and documentation (#1693)
• Update whats_new.rst etc. for 1.9.0 release (#1694)

With thanks to all who contributed to 1.9.0 development: @omad, @whatnick, @pjonsson, @alexgleith, @Kirill888, @robbibt, @snowman2, @caitlinadams, @Ariana-B, and @SpacemanPaul