added read_csv_fast - it's simple and fast but can't handle even quoted fields.  Use read_csv if your csv file is more complicated.
added CRLF flag for write_csv
added set_string_column_length in core block code. A few other tweaks to work better with LLVM.
added makefloat and makeintfromtime to columns util for string fields like "6:45:34" - converts to seconds after midnight.  It's a terrible hack job, this file needs a refactoring.