R41

• new function mysql_error: retrieves the error message of the last unthreaded MySQL command
• new function mysql_tquery_file: execute all queries from a file threaded
• mysql_query_file can now return a cache with all results of executed queries
• bug-fix: log levels are defined incorrectly
• bug-fix: crash when an empty string value is passed to a callback
• bug-fix: log calls from natives don't work when PAWN debug information aren't available
• bug-fix: curly braces in debug log arguments crash the plugin
• log level changes are now always logged
• escaping empty strings in mysql_format will not result in an error anymore
• improved/added some log messages