Modify test file to remove the (low) iteration cap when using counters
Remove row and column identifier, and use a single index for both

Conflicts:
	src/main/java/ml/grafos/okapi/graphs/AffinityPropagation.java
Implemented AP edge input reader. initialization logic not implemented yet.
Implemented extra logic for edge-defined problems.
Support for sparse graphs.
Added test with ToyProblem from AffinityPropagation website.
Removing commented code.
Fixing APEdgeInputFormatter javadoc
Result expectations for AP test cases