Cosmetic changes (remove commented blocks for unitary tests).

src/@arima/estimate.m

src/@dates/end.m

src/@dates/isempty.m

src/@dates/length.m

src/@dates/mtimes.m

src/@dates/pop.m

src/@dates/pop_.m

src/@dates/private/comparison_arg_checks.m

src/@dates/remove.m

src/@dates/sort.m

src/@dates/subsasgn.m

src/@dates/vertcat.m

src/@dseries/abs.m

src/@dseries/abs_.m

src/@dseries/align.m

src/@dseries/align_.m

src/@dseries/baxter_king_filter.m

src/@dseries/baxter_king_filter_.m

src/@dseries/center.m

src/@dseries/center_.m