Allow an inflation factor for income in the household file

[mabcal]

The variables in the models that use income groups were based on 2000 income. The income that is on the household file from a survey or from a synthetic populatoin may be in different year's dollars. So, a new configuration setting

HouseholdIncomeAdjustmentFactorTo2000Dollars

is added. This is applied automatically in household wrapper so that any of the standard household properties related to income are calculated with the factor applied.

Whenever using household.Income anywhere else in the code and want it to reflect 2000 dollars, use this factor.

The default value is 1.0, to be backwards-compatible.

For SACOG which has 2017 $ in the household survey, the factor used is 0.702 (1 dollar in 2017 = 0.702 dollars in 2000).