HW2: RawFrequencyAnalysis() sort the result alphabetically
HW2: Improve RawFrequencyAnalysis() performance
	remove unnecessary 'tokensFreqs' sorts
HW2: documenting + reorganize the code
HW2: Sort PmiAnalysis() output alphabetically
HW2: Sort tTestAnalysis() output alphabetically

Signed-off-by: unknown <zkk12345@gmail.com>