This method creates a new point for the agent to be placed
randomly within the urban area using JTS CoordinateArrays
class http://vividsolutions.com/jts/javadoc/com/vividsolutions/jts/geom/CoordinateArrays.html
The method first finds the max and min x and y values and
creates a random new point between these values, and then
checks to see if the agent is within the urban layer extent if
not, a new random point is chosen until it returns true.
randomPoints -
Variable in class uk.ac.ucl.casa.andrew.phd.segModelFourTypesCombined.UrbanAgent
Used to remove an agent at the moment it is only used when an
agent becomes to old ie 50+
Resdients are removed but their index (gisResidentAgentIndex
is not altered.