RandomMoveInGrid/assignment.txt
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0. Change the default size of the world and the number
   of agents created.  Compile, run.

1. Add a debug message to Agent step() that
   prints out the x and y values in the Point returned
   from  model.moveObjectInWorld( this, dx, dy )
   (when it does return a Point!)

2. Change Model-stepReport() so that it calculates the
   average Y location of agents and prints that to
   the report lines.  (Change the "header" info
   in the report file, too.)

3. Add a new parameter, chipDensity, using the 
   instructions in howTo-AddParameter.txt

4. Add a new class, WoodChip, using the instructions in  howTo-AddNewClass.txt .

5. Use the new class WoodChip in Model buildModel()
   to create woodchip instances and place them randomly
   in the world.   Use the chipDensity parameter
   to control how many to create.
   Note some issues:  how to make sure there is enough
   room for chips and ants; not placing them
   on top of each other; creating a list to keep track of them.

6. Change the Ant step method so that (before it moves?)
   it checks its neighbor cells to see if there is a chip
   in any of them.   Add a debug message to indicate
   if any found, and if so, where.
   (Note: what if there are more than one neighbor chips?)
   There are two ways to do this:
   a. write methods that use the methods you know about
      to find out what is in neighbor cells, eg getObjectAt();
   b. look at the Repast API for the Object2DGrid class and
      use the one of the getMooreNeighbors() methods.

7. Change the Ant's so that they have an IV that can be null (no chip) 
   or can store the address of a WoodChip object that it is carrying.
   Add a printSelf() method that prints that info,
   along with other "state" of the ant.

8. If an ant is not carrying a chip, and is next to one,
   it picks it up.  Note:  what all has to be changed,
   in which objects, when a chip is "picked up"?

9. If an ant is carrying a chip, and it senses one next to it,
   change the ant so it puts the chip down in an open cell
   contiguous to the one with the chip.

10. Then what??
    Run the model, see what happens, and think about ways to
    change the Ant behaviour so they perform as described in
    the NetLogo description.

    Also -- what could you be measuring and writing to the report
      file or plotting on the screen?
      - # Agents carrying chips?
      - Average over all chips, the #of chip neighbors they have?
      - Variance of chip population's average x,y values?
      - ?
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