overlay: use public getTrafficDensity() method to draw traffic overlay

git-svn-id: http://micropolis.googlecode.com/svn/trunk@860 d9718cc8-9f43-0410-858b-315f434eb58c
refactor: move traffic-density mutation code to new function

git-svn-id: http://micropolis.googlecode.com/svn/trunk@861 d9718cc8-9f43-0410-858b-315f434eb58c
cleanup: use getTrafficDensity() instead of directly accessing the array

git-svn-id: http://micropolis.googlecode.com/svn/trunk@862 d9718cc8-9f43-0410-858b-315f434eb58c
refactor: make public getLandValue() method for accessing landValueMem[]

git-svn-id: http://micropolis.googlecode.com/svn/trunk@863 d9718cc8-9f43-0410-858b-315f434eb58c
overlay: use public getLandValue() method to draw landvalue overlay

instead of directly accessing the landValueMem[] array

git-svn-id: http://micropolis.googlecode.com/svn/trunk@864 d9718cc8-9f43-0410-858b-315f434eb58c
city-eval: use public getTrafficDensity() instead of direct access

of trfDensity[] array

git-svn-id: http://micropolis.googlecode.com/svn/trunk@865 d9718cc8-9f43-0410-858b-315f434eb58c
copyright: add copyright notices to source files missing it

git-svn-id: http://micropolis.googlecode.com/svn/trunk@866 d9718cc8-9f43-0410-858b-315f434eb58c