client sync: fix a potentially *major* annoyance with save causing multiple syncs.
client sync: fix a potentially *major* annoyance with save causing multiple syncs.

DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,sagemathinc/smc,sagemathinc/smc,DrXyzzy/smc