Eleventh version

I manage to get comparable for volatility of capital, investment and
hours as in Mendoza. However this is done by not putting rho_en to zero.
This suggests 1) either I understood badly what his stochastic process
was; 2) or he made a mistake. In page 810 of his paper where he
explicitly sets rho_en to zero I found completely different results to
what he found. However, when putting rho_e = rho_n to zero and rho_en =
0.356 I manage to get similar results. However would not conclude that
hypothesis 2 is right until I am a hundred percent sure.