Insulate the Directed Step algorithm against NaN satisfaction by mapping it to zero. Add support for an excursion hint.
Insulate the Directed Step algorithm against NaN satisfaction by mapping it to zero. Add support for an excursion hint.

openxal/openxal,luxiaohan/openxal-csns-luxh,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,openxal/openxal,openxal/openxal,openxal/openxal,EuropeanSpallationSource/openxal,luxiaohan/openxal-csns-luxh,luxiaohan/openxal-csns-luxh,openxal/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,luxiaohan/openxal-csns-luxh