CSVParserTest:
 - Add basic parser test for all parse/constructor variants.
 - Add parser test for null Path.
 - Fix parser test for null URL that was cast to File.
 - Fix parset test for null File/format so it does not pass an illegal file name and trigger a FileNotFoundException (only prevented by the sequence of arg validation).
 - Convert all arg validating tests to use try resource blocks.

PerformanceTest:
 - Fix perf test so that it doesn't look for the input file in the java.io.tmpdir but instead as a relative path.
 - Add basic parse timings for other constructor variants using Path and URL.
 - Avoid creating a redundant BufferedReader in basic parser test.
 - Use printf.