Django Evolution has supported Meta.indexes and the Index object for

a while, but lacked an assortment of features present since Django 2.0.

These include:

db_tablespace (Django 2.0+)
condition (Django 2.2+)
opclasses (Django 2.2+)
expressions (Django 3.2+)
include (Django 3.2+)

This change introduces support for all of these features, allowing them

to evolve successfully.

Unit tests pass on all supported versions of Python, Django, and all

databases.