Connect the child contacts with the parent contacts

Connect the child contacts with the parent contacts

Added new code on the contact list, and a filter in functions.php,
which work together to look at all contacts which are a primary
contact, and by those contacts list all the contacts associated
with the same member which aren't primary contacts (the 'child'
contacts). Also added most of the fields that were not already
showing up for member contacts, on their list.