Fixed a bug in makeMarkovApproxToNormal in HARKutilities.py (#126)
Fixed a bug in makeMarkovApproxToNormal in HARKutilities.py (#126)

* Fixed a bug in makeMarkovApproxToNormal in HARKutilities.py.  Before, it would sometimes return negative values.  Also created another function, makeMarkovApproxToNormalByMonteCarlo, to (surprisingly enough) to do the same thing, but by Monte Carlo.  The two functions should produce similar output.

* Fixed error check in makeMarkovApproxToNormal

econ-ark/HARK,econ-ark/HARK