Merge branch 'master' into ecb-master

src/@dseries/dseries.m

src/@dseries/length.m

src/@dseries/resetops.m

src/@dseries/resettags.m

src/@dseries/size.m

src/@dseries/subsref.m

src/initialize_dseries_toolbox.m

src/utilities/struct/dseries2struct.m

src/utilities/struct/struct2dseries.m