simple math function for other Oxford Nanopore processing scripts

 This Python3 module provides a few simple math and statistics functions for
 other scripts processing Oxford Nanopore sequencing data.
 .
  * Calculate read N50 from a set of lengths get_N50(readlenghts)
  * Remove extreme length outliers from a dataset
    remove_length_outliers(dataframe, columname)
  * Calculate the average Phred quality of a read ave_qual(qualscores)
  * Write out the statistics report after calling readstats function
    write_stats(dataframe, outputname)
  * Compute a number of statistics, return a dictionary
    calc_read_stats(dataframe)