Invite a new user to sign up to the site via email

Note this requires the following BuddyPress settings to be enabled:

• Notifications
• Allow registered members to invite people to join this network

  if ( bp_members_invitations_invite_user(array('invitee_email' => $EmailAddress, 'content' => 'This is an optioanl message to add to the email sent', 'send_invite' => True)) )
    $ShowMessage = "An invitation email has been sent.";
  else
    $ShowMessage = "An error coccured.";