tweaks

[petednz]

FIXES

1. needs tweaking so works for checksum
2. need to confirm what permissions a person needs for this to work
3. need to confirm it works for multiple registrant (seems to other than problem
4. need to ensure the dropdown/autocomplete ONLY lists individuals

TESTING
i masqueraded as Kaylie, registered myself p1 and gemma p2 using 'related contact' but kaylie's record was overwritten with Peter's name instead of registering Pete

OTHER
documentation needs to state

• it works for checksums (if it can)
• it works for multiple contacts (and folk already selected are then removed from list on subsequent pages)