add stopwords from google ngrams according to conditions in file name
$ cat eng_1m_ascii_countsByngram_ge1990.tsv|tawk '{if(length($1)>2 && $2 > 10000)print tolower($1)}' | sort | uniq > junk2geo/stopwords/google_1grams_lengthGT2_countGT10000_yearGE1990.tsv

improve match_metrics.sh:
* move functions out of gnu paralle
* user flags
* input and output as tsv