Provide moment conditions for Mean/StdDev GMM estimation
[m,e] = gmmMsdM(b,gmmopt,Y,X,Z)
* b = parameter vector fed to function
* gmmopt = gmm options tlist
* Y = "dependent" variables
* X = "independent" variables
* Z = instruments (can be same as X)
* m = vector of moment conditions
* e = model errors (Nobs x Neq)