This (internal) function checks for the existance of the desired file, of which the name is passed to the function. If the file exists it is silently read with read_csv from the readr-package, else it returns an error.
The filename to be read in, files originaly come from https://www.nhtsa.gov/research-data/fatality-analysis-reporting-system-fars but these functions expect an bz2-zipped format
the read data is transformed in a data.frame
filename' does not exist" when file is not found
a data.frame with the contents of the file-data when the file is found and read correctly
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