First draft of cons agg Markov solver
First draft of cons agg Markov solver

Wrote solver for ConsAggShock with a discrete Markov state, representing
a "macroeconomic" state.  As written, only PermGroFacAgg and IncomeDstn
depend on the macro state; this can easily be extended to include
BoroCnstArt and probably other inputs like in ConsMarkovModel.

Also fixed double counting error for PermGroFac in solveConsAggShock.

econ-ark/HARK,econ-ark/HARK