* Added a 'STACK_SCHED_CODES' table to the database.
* Dropped the 'STACK_LINES.SCHED_CODES' field from the database.
* Incremented the database version to 308.
* Renamed the 'SchedCartList' class to 'RDSchedCartList' and
refactored it to be idiomatic Qt.
* Renamed the 'SchedRulesList' class to 'RDSchedRulesList'.
* Fixed a bug in 'rdlogmanager/editschedrules.cpp' and
'rdlogmanager/editschedrules.h' that caused scheduling rule data
to be corrupt if the rules list was resorted [GitHub issue #000054].