addRecommendedEfficiency
                        Function that adds recommended efficiency
                        speedup lines and points to benchmarks
findOptimalThreadCount
                        Function that finds the optimal (fastest)
                        thread count for different 'data.table'
                        functions
plot.data_table_threads_benchmark
                        Function to make speedup plots for the
                        benchmarked 'data.table' functions
print.data_table_threads_benchmark
                        Function to concisely display the results
                        returned by 'findOptimalThreadCount()' in an
                        organized table
runBenchmarks           Function to run a set of predefined benchmarks
                        for different 'data.table' functions with
                        varying thread counts
setThreadCount          Function to set the thread count for a specific
                        'data.table' function
