v1.6.0

NOTE:

This release includes a hotfix for a download error in Cartopy. As soon
as the Cartopy team is able to fix this in a new release we will update
our version requirements and remove the hotfix. For more information
about the underlying problem, see nvkelso/natural-earth-vector#581.

This release includes major API changes:

• Render module (tracktable.render) has been refactored to abstract away
  details of the back end

• Analysis module (tracktable.analysis) has been split into Applications
  (tracktable.applications) and Algorithms (tracktable.algorithms).
  Bindings from the Analysis module are still in place with deprecation
  warnings and will be removed in release 1.8.

The Applications module contains functions for prediction, anomaly
detection, clustering, and "boxiness" (how close a trajectory is to a
perfect square). We will be refining and updating these modules
in the next few releases.

We've added better debugging support for our import process. The common
error about being unable to import _core_types has been augmented by
tests to find out exactly where in the import chain things are going wrong.

This release also includes revamped Python tutorials and demos which should be easier to follow
and try out for yourself! Find them in the code at ...tracktable/Python/tracktable/examples
and on ReadTheDocs at https://tracktable.readthedocs.io/en/latest/examples/examples.html.