off by one error

set active_query_string to null in case of failure

keys need to be null-terminated (how did this not get committed before???)
bind-by-name includes the leading : in the name

Added lastInsertId() method for retrieving last insert id.
Made affectedRows() work for MySQL.
Populate error value in MySQL on error.

forgotten off the last commit

Update generated parser

for those without re2c