Release notes etc for 3.6.4

For the last minute #5346

docs/link.html: fix/remove undefined template var "schema"

Fix introspection of list field in schema

Fix docs multiple nested and multiple methods

Update fields.py

modify to_choices_dict document

Closes #5301

Fixes #5247

related_name for Token is `auth_token`, not `token`.

Add documentation to create user token with the new command

RemoteUserAuthentication, docs, and tests

> keeps you error messages

to

> keeps your error messages

and 

> more cleanly separated from your code

to 

> cleaner and more separated from your code

The blog post referenced in the documentation has been since moved to a new location.

* Add regression test for #2505. Thanks @pySilver!

* Add regression test for #5087

* Revert "Cached the field's root and context property."

This reverts commit 79200580.

* Removed Micropyramid as a sponsor

* Changed monthly report link

Added the django user model

Accidentally also deleted a line.

So it is possible to copy paste the example and it will work out of the box.

typo: may -> many