Read the contents of a relax results file into the relax data store.
file: The name of the file to read results from.
dir: The directory where the file is located.
This is able to handle uncompressed, bzip2 compressed files, or gzip compressed files automatically. The full file name including extension can be supplied, however, if the file cannot be found the file with `.bz2' appended followed by the file name with `.gz' appended will be searched for.