Recca package, many functions add columns to an existing data frame.
If the incoming data frame already contains columns with the names of new columns to be added,
a name collision could occur, deleting the existing column of data.
This function provides a way to quickly check whether
newcols are already present in
the data frame to which
a single string, a single name,
a vector of strings representing the names of new columns to be added to
This function terminates execution if a column of
.DF will be overwritten
by one of the
NULL. This function should be called for its side effect of checking the validity
of the names of
newcols to be added to
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