extract_ts: Extract gap filtered time series
In jthurner/baseflowchile: Streamflow data for Chile

The metadata table must have gap statistics columns matching the date range(s), as created by gap_statistics.

1 2	extract_ts(x = cl_streamflow_mm, md, date_ranges, c_d_min = 80, c_m_min = 80, lg_max = 6, excelfile = NULL, outdir = NULL)

`x`	x daily timeseries (tibble) with Date and data columns named with the stationcode
`md`	metadata table (tibble) with a stationcode column containing the stations to be used
`date_ranges`	date range(s) (character or character vector) formatted as "start-end" in years
`c_d_min`	minimum daily completeness
`c_m_min`	minimum monthly completeness
`lg_max`	maximum gap length
`excelfile`	file path to write excel table with metadata per date range as workbooks, optional
`outdir`	directory path for saving timeseries into univariate files (see `write_univariate`), optional