Scenario: A user is invited to an event. The user signs up for the event (via the Signup) module first. Later on, the user sees the invitation, but replies "NO" to it. The user is still signed up for the event, but shouldn't be.

This patch will remove a signup for a given user if they respond "NO" to an invitation.

(it also removes the check to see if the signup module is installed. it's already a module requirement so it must be. no need to check!)

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