Improved and bugfixed the MySQL slow query log file format.
Improved and bugfixed the MySQL slow query log file format.

* SQL queries that span over multiple lines are combined correctly, so the preprocessor is no longer needed.
* Parse "use database;" lines separately.
* Fixed a bug in the user@host line parser.
* There is a patch for mysql to report query duration as a float instead of an integer in the slow query log. The regexp for this line is updated to parse these float values as well.
* Improved rewriting of SQL queries to categorize even better and get more readable results.
* Fixed a bug in the timespan converter method.
* Added a timespan tracker to the report.
wvanbergen/request-log-analyzer,cornerot/request-log-analyzer,technicalpickles/request-log-analyzer