parameters, minor bugs

- set up parameters, should now be complete
- fixed bug with agent indexes that would allow duplicates
- fixed bug introduced in prior version: actualDeathRate needs to be
per agent, with the default being the starting position, as actualDeath
Rate changes based on hunger
- added new statistics method for end of simulation
- added finish method in PVP_2 to run when simulation completes
- updated some comments to javadoc
- added some debugging statements, all commented out in this commit
not changed
Merge branch 'JuneRuns' of https://github.com/rfraczkowski/PVP_V2 into JuneRuns

Conflicts:
	Animal.java
	PVP_2.java
	Predator.java
	Prey.java
	StatisticsAgent.java