SgaGeneral.h

Any users of this class should make sure to call the project function (for monthly projections) because the constructor only initializes the historical data. 

The only thing here that might ever need to be updated is FIRST_PROJ_YEAR. This does not need to be updated for every TR. For example, in the 2005 TR, the FIRST_PROJ_YEAR could still be 2001, even thought 2001 is really an historical year. This is because the only information the projection needs is the updated Average Wage Series (which does get updated every year). Once the average wages are updated, the projections will work automatically. 

So the only reason to change the FIRST_PROJ_YEAR would be if there was some change in the law that would not let the projections kick off from 2000 amounts. In such a case, make sure to: 

1) Set FIRST_PROJ_YEAR correctly (in this file). 

2) Go to the function SgaMinM::project in the file SgaDerived.cpp, and update the hard-coded number that over-writes the data value in year FIRST_PROJ_YEAR - 1. This number should match the max value for the corresponding year. 

3) In the file SgaDerived.cpp, update all the calls to construct an SgaGeneral with the proper base years passed in (if they have changed). 

4) In the file SgaDerived.cpp, update all the constructors which initialize data. They should make sure to initialize the data for all years up to (but not including) FIRST_PROJ_YEAR - 1.

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