List of problems with current implementation of SBVAR and MS-SBVAR

VAROBS should not be necessary (MS-)SBVAR should assume VAROBS = VAR or options_.varobs = M_.endo_names. When VAROBS is present, the order of variables in VAROBS takes precedence over the order in VAR statement.
Restriction on the coefficients of the lagged variables precludes Sims-Zha prior