Class parseCSV now implements the Iterator interface, interface function
support whole and chunked reading of csv files
parseCSV's constructor-, parse-, load_data-, parse_file- and
_rfile-functions can now handle open already open files als resources,
which makes reading from zip-files, stdin, etc. possible
*fixed bug in CSVReader - not ignoring last line of csv anymore
added some more configuration options, whether csv files should be read
as whole or chunked. also added a position counter for the iterator
interface