fixes #99 XML schema supports multiple schedule elements but processor does not
fixes #95 Trace throwing exception
fixes #93 DailyTimeIntervalTriggerPersistenceDelegate does not handle empty time interval properly
tables_mysql_innodb.sql contains unnecessary duplicate indexes
small typo in job_scheduling_data_2_0.xsd
remove unnecessary use of String.Intern() in DBSemaphore
add minimal constructor to StdRowLockSemaphore
fixes #98 Start Time of Day is not set correctly in DailyTimeIntervalTriggerPersistenceDelegate.GetTriggerProperties