Added DB setting 'outsideNumberPrefix', will auto add a prefix to any
number that is an external call if this is set.

External call is classed as 6+ digits (based on UK standards)
TODO Removed, leading 9s from DB task complete

BUG FIX: Wasn't always notifying when we answered a call when dialling
out.  Fixed.
Work Arounds for call that is placed by you then updating the record for
your own phone rather than the receiver.
TODO Call from similar channels may need looking up if this call has no
details attached to it (due to channel switch)
Added comments to explain timezoneOffset
Removed ANSWERED_ME colour and set to normal ANSWERED as it looked
horrible