proc fromFiles(filenames: seq[string]; config: Config): Table[string,
    Table[string, string]] {...}{.raises: [ValueError, GenericError, KeyError,
                                      IOError, InvalidIndexError,
                                      UnsupportedCharacterError, OSError,
                                      ConflictingValueError, DuplicateKeyError,
                                      Exception], tags: [ReadIOEffect,
    ReadDirEffect, WriteIOEffect, RootEffect].}