better comments
Parallelizing metadata parsing\nSwitching the Metadataparser.py to be spawned outside OneClick.py to allow easy use of multiple cores by allowing reading from and to stdin/stdout as well as the named files.\n\nAlso switched the error messages to stderr instead of stdout, because, why not? And slight modifications to the date parsing (mostly returning ints instead of strings in the field values, which is unimportant but cleaner.)