Added a telework (work at home) submodel to the IndividualPersonDayPatternModel about daysim

[mabcal]

More on this - the output choice is written to the wkathome field on the person-day output file. A value >0 (set to the threshold +2 and rounded) indicates that the person works at home for more than the threshold duration. For the base SACOG survey application, the model predicts that about 13% of workers do this, which is the same as in the survey data used to estimate the model.

[stefancoe]

@mabcal @nsdhakar When testing this functionality at PSRC, I noticed the changing the alternative specific constant did nothing to the results. Debugging the code, it seems like the utility terms are not being being added to the model because the ChoiceProbablityCalculator looks for the coefficient numbered 20, does not find it and exits the AddUtilityTerm function before it can assign 'value' (which is the passed in utility term). Looking at the rest of the code in this function, I am not sure that value would ever get assigned properly since the subsequent code also needs the coefficient variable to not be null.

[mabcal]

There needs to be a coefficient 20 in the IndividualDayPatternModel coefficient file with coefficient 1.0...it looks like

20 X-WKATHOME T 1.0 0

[stefancoe]

Thanks- that worked!