Tomtoolkit

This release includes most, but not all, of the upgrade to the new ALeRCE API. It should be considered to be in beta as long as the disclaimer at the top of the ALeRCE query form is present.

This release supercedes the mistaken 2.6.1 release and includes the fix for spectroscopic migration alluded to in 2.6.1. It also includes a stub module for the Fink broker.

This release contains the following:

- Refactors user_list to use templatetags in order to facilitate introduction of new [tom_registration](https://github.com/TOMToolkit/tom_registration) installable app.
- Adds django-rest-framework API endpoint for cancelling observations.
- Adds support for assigning group permissions to observations submitted via the django-rest-framework API endpoint.
- Upgrades ``numpy``, ``astropy``, and ``astroplan``, and removes support for Python 3.6.

What to watch out for

- HTML in ``user_list.html`` has been replaced by templatetags, so anyone overriding the ``user_list.html`` template should copy the changes. They can be reviewed in [this pull request](https://github.com/TOMToolkit/tom_base/pull/430/files).
- HTML for login buttons in ``base.html`` has been replaced by a templatetag. Changes can be reviewed in the above pull request.
- Support for Python 3.6 has been removed.

This version includes the following:

- Removes support for Python 3.6, and upgrades ``numpy`` to 1.20, ``astropy`` to 4.2, and ``astroplan`` to 0.8.
- Refactors ``user_list.html`` into templatetags to support introduction of installable app ``tom_registration``.

This release addresses the following:

- Retains the selected tab on reload for target detail page, as well as selected filters on target list and observation list when updating statuses. (427)
- Adds new statuses supported by the LCO facility. (409)

What to watch out for

- In order to leverage the tab retention, you'll need to copy the changes in ``tom_targets/target_detail.html``, ``tom_observations/observation_list``, and ``tom_targets/target_list.html``. You can review [this pull request](https://github.com/TOMToolkit/tom_base/pull/436/files) to see what has changed.