split_save: Export a single dataset into multiple files by group
In ICPI/ICPIutilities: Utility functions for working with or creating ICPI products

Export a single dataset into multiple files by group

1	split_save(df, group_var, folderpath, filename_stub, include_date = FALSE)

`df`	dataframe to split
`group_var`	grouping variable to split the dataset by, eg operatingunit, fundingagency
`folderpath`	directory where you want to store the files
`filename_stub`	generic stub for naming all the files
`include_date`	include date after filenamestub? default = FALSE, eg "20180913"

## Not run: 
#create country specific files for TX_NEW
 df_mer %>%
  filter(indicator == "TX_NEW",
         standardizeddisaggregate == "Total Numerator") %>%
  split_save(operatingunit, "~/CountryFiles", "FY18Q3_TX")

## End(Not run)