OuterLeftRows: Left fuzzy date join
In ldnicolasmay/FuzzyDateJoin: Joins of Longitudinal Data by IDs and Fuzzy Dates

Left fuzzy date join

1 2	OuterLeftRows(x, y, x_id_col, y_id_col, x_date_col, y_date_col, x_intvl_less = 0L, x_intvl_more = 0L)

`x`	X data frame.
`y`	Y data frame.
`x_id_col`	Name of column in X data frame with IDs.
`y_id_col`	Name of column in Y data frame with IDs.
`x_date_col`	Name of column in X data frame with dates.
`y_date_col`	Name of column in Y data frame with dates.
`x_intvl_less`	Number of days before X date to match to Y date. Defaults to 0.
`x_intvl_more`	Number of days after X date to match to Y date. Defaults to 0.