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	This deprecates use_for_related_fields.
Old API:
class CustomManager(models.Model):
    use_for_related_fields = True
class Model(models.Model):
    custom_manager = CustomManager()
New API:
class Model(models.Model):
    custom_manager = CustomManager()
    class Meta:
        base_manager_name = 'custom_manager'
Refs #20932, #25897.
Thanks Carl Meyer for the guidance throughout this work.
Thanks Tim Graham for writing the docs.