makeBinVars: makeBinVars
In etesdahl/claimWranglR: Utility Functions for Working with Health Claims Data

This function will create a set of n binary variables to indicate the presence or absence of a each element of a user-defined vector of n strings, where the string of interest may appear in one or more data.frame columns.

1	makeBinVars(codes, dfCols, data, key, outName = "newBinVars")

`codes`	A character vector of the codes of interest.
`dfCols`	Either a character vector reflecting the names of data columns to look through for x, or a numeric vector of column indices.
`data`	A dataframe containing individual claims-level data.
`key`	Either a character vector or column indices to indicate the unique key necessary to allow for merging back to original dataset.
`outName`	Name for the list object given as output of this function. "newBinVars" will be applied as default unless another string is given.