Add field to use cubic spline interpolation for PsyTsatFnPb to PerformancePrecisionTradeoffs

[JasonGlazer]

Issue overview

Currently Mode06 is the only way to trigger the use cubic spline interpolations in replacement of the psychrometric
function PsyTsatFnPb in PerformancePrecisionTradeoffs. All the other Modes in PerformancePrecisionTradeoffs also have a way to trigger that function independently. A new field should be added to PerformancePrecisionTradeoffs to do this.

Details

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• Platform (Operating system, version)
• Version of EnergyPlus (if using an intermediate build, include SHA)
• Unmethours link or helpdesk ticket number

Checklist

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• Defect file added (list location of defect file here)
• Ticket added to Pivotal for defect (development team task)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)

[shorowit]

Same issue as #9107

[JasonGlazer]

Somehow I missed that the issue already existed. Closing this one.