remove call to write_phrases_to_file inside extract_phrase_pair_freqs. check if input and output paths are valid. optional argument -r determines whether do_the_work2 (if given) or do_the_work (if not given) is executed. removed looking for existing phrase table. remove duplicate check for number of processes.
change open file style. add newline when writing *_extracted_phrases.txt
new open file style in all_phrase_info_to_file
fix calculating word pair frequencies