* Return weekly contracts if no standard contracts exist
* Fix unit and regression tests
* Centralize default expiration type flags
* Add ExcludeWeeklys() method
* Mark IncludeWeeklys() as obsolete since weeklies are now default
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* Add ShortButterflyCall and ShortButterflyPut strategies helper factory methods
* Reduce duplication by adding the base OptionStrategyFactoryMethodsBaseAlgorithm algorithm class
* Housekeeping