add optional attribute to ogit/Timeseries
add optional attribute to ogit/Timeseries

bpneal/OGIT,bpneal/OGIT,arago/OGIT,arago/OGIT,ojubran/OGIT,ojubran/OGIT,bpneal/OGIT,bpneal/OGIT,ojubran/OGIT,arago/OGIT,ojubran/OGIT