[Design] Chandler against fresh Cosmo suggestion

[Jared Rhine]

As a Chandler user, when the Cosmo backend you're storing against gets wiped
(say cosmo-demo moving to 0.4 today), Chandler usability could be improved.

Chandler thinks it has shared the collection.  But when you sync, the
.chandler directory can't be found and the sync aborts.

The "restore published shares" looks promising to "restore"
deleted-on-server shares, but I don't think that but does what I think it
might just from the name.

Take online/offline doesn't do anything.

I'm not sure actually how to get Chandler back; Sheila's working on docs.

But design suggestion wise, it might be very cool if Chandler would recreate
a share that's missing on a service at the beginning of a sync operation if
it finds the share is missing outright.  That'd make, if I understand it,
recovering from a wiped server as easy as "Sync All".

-- Jared