Added Radical Polymerization with Chains.nlogo model. Also fixed a fe…

…w little test errors

.gitignore

@@ -318,6 +318,7 @@ target/
 /Sample Models/Chemistry & Physics/Materials Science/Molecular Dynamics Lennard-Jones.png
 /Sample Models/Chemistry & Physics/Materials Science/Monte Carlo Lennard-Jones.png
 /Sample Models/Chemistry & Physics/Materials Science/Polymer Dynamics.png
+/Sample Models/Chemistry & Physics/Materials Science/Radical Polymerization with Chains.png
 /Sample Models/Chemistry & Physics/Materials Science/Solid Diffusion.png
 /Sample Models/Chemistry & Physics/Mechanics/Random Balls.png
 /Sample Models/Chemistry & Physics/Mechanics/Unverified/Gravitation.png
@@ -442,10 +443,6 @@ target/
 /Sample Models/Social Science/Party.png
 /Sample Models/Social Science/Paths.png
 /Sample Models/Psychology/Piaget-Vygotsky Game.png
-/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma Basic.png
-/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma Basic Evolutionary.png
-/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma N-Person Iterated.png
-/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma Two Person Iterated.png
 /Sample Models/Social Science/Rebellion.png
 /Sample Models/Social Science/Rumor Mill.png
 /Sample Models/Social Science/Scatter.png
@@ -456,10 +453,10 @@ target/
 /Sample Models/Social Science/Traffic Grid.png
 /Sample Models/Social Science/Unverified/Artificial Anasazi.png
 /Sample Models/Social Science/Unverified/Minority Game.png
-/Sample Models/Social Science/Unverified/Prisoner's Dilemma/PD Basic Evolutionary.png
-/Sample Models/Social Science/Unverified/Prisoner's Dilemma/PD Basic.png
-/Sample Models/Social Science/Unverified/Prisoner's Dilemma/PD N-Person Iterated.png
-/Sample Models/Social Science/Unverified/Prisoner's Dilemma/PD Two Person Iterated.png
+/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma Basic Evolutionary.png
+/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma Basic.png
+/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma N-Person Iterated.png
+/Sample Models/Social Science/Prisoner's Dilemma/Prisoner's Dilemma Two Person Iterated.png
 /Sample Models/Social Science/Unverified/Traffic Intersection.png
 /Sample Models/Social Science/Voting.png
 /Sample Models/Social Science/Economics/Braess Paradox.png

Sample Models/Chemistry & Physics/Materials Science/Polymer Dynamics.nlogo

@@ -192,6 +192,7 @@ Allow monomers to break apart from the polymer, in some particular situations.
 In order for the model to operate correctly on a torus, the dimensions of the world must be even, so we put the world origin in the corner.
 
 ## RELATED MODELS
+
 Although this model is not strictly a cellular automata because it uses both patches and turtles, it is similar to them:
 
 - CA 1D Elementary - an introduction to cellular automata