access: a token with a limit changes no credentials

A token's limit narrows every endpoint but those under /auth, which any
registered user may call. Among them, PUT and DELETE /auth/keys/{id}
change the keys the user logs in with, and POST /auth/logout ends every
token of the user. With the token a dashboard hands to another member's
(the member list, read, five minutes), its holder could add a key of its
own and log in by it as the user, with everything the user may do.

These now take a password or a token without a limit
(Need::Credentials, refused where Caps::limited). A narrowed token still
refreshes within its limit, says who it is, lists the user's keys and
ends its own session (DELETE /auth/session): a dashboard opened from
another member's logs out with it.

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