draw_posterior_normal: draw posterior for measurement equation using a normal-gamma...
In kvasilopoulos/abvar: Vector Autoregression Models

draw posterior for measurement equation using a normal-gamma prior

1	draw_posterior_normal(li_prvar, fy, xy, K, P, N, Sigma, L, alpha, beta)

`li_prvar`	prior on variance for coefficients
`fy`	'independent' variables
`xy`	'dependent' variables
`K`	number of variables in ts model
`P`	Number variables in ts model plus number of factors
`N`	total number of variables in factor data
`Sigma`	previous draw of variance-covariance matrix
`L`	previous draw of coefficients
`alpha, beta`	prior on variances