Ovp-users

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* Add unspecified gender option
* Stop requiring email on password recovery
* On Userprofile, test if cached value is instance of the profile class
* Add public in CurrentUserSerializer
* Remove User.PUT, use User.PATCH
* Add CANT_REUSE_LAST_PASSWORDS setting

v1.1.9[unreleased]
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* Add gender to Profile
* Optimize User.profile property to use cached profile object

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* Remove 'applies' from ShortUserPublicRetrieveSerializer"

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* Add slug field. Default is shortuuid
* Add User.public field.
* Remove UserProflie.public field.
* Remove id from UserSearchSerializer
* Rename UserPublicRetrieveSerializer to ShortUserPublicRetrieveSerializer
* Add LongUserPublicRetrieveSerializer
* Replace id with uuid on UserCreateSerializer, UserProjectRetrieveSerializer, UserApplyRetrieveSerializer, ShortUserPublicRetrieveSerializer
* Add PublicUserResourceViewSet

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* Add dynamic profile models

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* Fix User.uuid migration
* Update UserProfile.user related_name to 'profile'