Reads a .csv file, typically an FLP20 output from FConstMTT, for single fire event simulation,
and reshapes the data to long format, calculating flame length (FL) from `FIL` columns.
`PBurn` is expected to be 1 for individual fires, and `FIL` columns are binary (1 or 0).
Usage
flp20_to_df(file)
Value
A data frame with reshaped data, including `name` (original FIL column index)
and `FL` (calculated flame length).
Arguments
file
A character string specifying the path to the FLP20 .csv file.