The method creates a hashmap from info calculated in
urbanAgentContainsResidents method (ie newReturnResList) places
the information into a hashmap which is then used in the step
method.
Creates a new point shapefile containting all the resident agents
this uses information from the Resident class specifically information
in the gisPropertyList()each element in the dbf file needs a get and
set method in a similar way to reading in and storing changes in the urban agent.