PL files come in one of four types and are pipe-delimited with no header row.
This function speedily reads in the files and assigns the appropriate column
names and types.
Usage
pl_read(path, ...)
read_pl(path, ...)
Value
A list of data frames containing the four PL files.
Arguments
path
a path to a folder containing PL files. Can also be path or a URL
for a ZIP file, which will be downloaded and unzipped.