join_wse: Join water-surface elevation information
In mkoohafkan/rremat: Russian River Estuary data collected by the Largier Lab

Attach maximum water-surface elevation recorded in CTD transects to gridded data.

1 2	join_wse(d, ctd, joincols = c("date", "id"), wsein = "elev", wseout = "wse")

`d`	Dataframe containing data to have water surface elevation attached to.
`ctd`	Dataframe containing ctd transects matching grids in `d`.
`joincols`	Columns to use when joining `ctd` to `d`.
`wsein`	The name of the column in `ctd` containing water-surface elevation data.
`wseout`	The name of the column containing water-surface elevation data to be added to `d`.