housefriends - property on house signs that define the friends of the house.  This
property is a dictionary.  They keys are either the accountname of the friend of the
house (if they whole house has been defined as a friend) or the serial number of the
friend (if its only the single character that has been set as a friend.)

The value of the entries are an array, which contains:
[1] - friendtype.  Possible values are:
	'account' - grants full friend privledges
	'character' - grants full friend privledges
	'merchant' - only allowed to place merchant in house (no lock/unlock)
[2] - the name of the player that was set as a friend
