Refactoring: removing unnecessary boxing (new Long)
Fix committers related queries.
Refactoring: declare variable just when necessary
Ignore account start with "#".
Comment eigenvector metric.
Removing duplicated metrics.
Refactoring variable name.
Fix code churn of pair file queries (using native sql).
Implementation of calculation code churn for one file.
Refactoring types and extract method.
Fix possible division by zero.
Using object types instead primitive and long instead double when possible (more precision).
Convert JPQL to native query.