Added Skeleton for changing a person.  Button is in place but does not
respond.

Need to make a Dialog for searching and setting a new active person
Added: Facility to add a new person who will become active in the
phonecall record (for use when a user changes the person on a call e.g.
1 number for the whole family etc)
PersonChangedListener for use with SearchPanel Dialog
Beginnings of SearchPanel Dialog
Strings for Search Panel
Start of SearchPanel implementation