that does not understand nullptr
Note that we can't just replace nullptr by 0 in createIndex otherwise
it would be ambiguious.
So leave it commented to show that your intention is to create it with
a null pointer (which is the default because of the default parameter)
For unencrypted connections there used to be a small arrow indicating
that more information was available, but clicking the button had no
effect. That indicator is now gone because we unset the SslButton's
menu for these cases.
* Use a shared pointer to Account everywhere to ensure
the instance stays alive long enough for a sync to terminate
* Folder is now tied to an AccountState
* SyncEngine and OwncloudPropagator tie to an Account and use that
for all jobs they run
Issue: Since the setup wizard currently always replaces the
account, it will always wipe all folder definitions, even when
the actual changes to the account were minor.
This allows all the account state information to live in gui
while the sync-relevant data stays in libsync.
I also moved quotainfo to gui since it depends on the account state.
