Expose three methods copied from STARTS for better readability

[pengyuejiang]

emop/emop-maven-plugin/src/main/java/edu/cornell/ImpactedClassMojo.java

Line 61 in f49935b

// TODO: Change STARTS so that it exposes the three methods needed here

In the comment mentioned above, ImpactedClassMojo copied three private methods from a class in STARTS. Copying this much code is not good for readability.

Solution: Change the signature in a STARTS branch (impacted-both-ways) to have access modifiers of protected.