VOL-54: Simplified new profile markup. Rewrote show/hide logic to catch some edge cases.
VOL-54: Added back in Volunteer Activity fields (role, need).
VOL-54: Removed hardcoded "Additional Notes" field from sign-up form.
VOL-54: Refactored $this->getProfileIDs(), using uf_join directly instead of by way of multiform.
VOL-54: Refactored buildCustom() method. Relies on getProfileIDs instead of taking arguments.