Gender statistics redux, average 2012-2016

Processed version of https://figshare.com/articles/Gender_statistics_from_World_Bank_-_CSV_-_September_2017/9904979 This version is a much-reduced and rearranged version. It has been tidied to have one row per country, and has a few variables, mainly relating to expenditure, fertility, mortality. The data are an average of the values from 2012 through 2016. See https://github.com/matthew-brett/dsfe/blob/058e4c6/data/make_gender_stats.ipynb for Jupyter notebook that implements this processing.