update comments. remove unused methods from sync logs
update comments. remove unused methods from sync logs

qedsoftware/commcare-hq,dimagi/commcare-hq,SEL-Columbia/commcare-hq,SEL-Columbia/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,puttarajubr/commcare-hq,puttarajubr/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,puttarajubr/commcare-hq,dimagi/commcare-hq,puttarajubr/commcare-hq,SEL-Columbia/commcare-hq