Unfortunately checking the base-url for redirects in all cases lead
to incorrect behavior in some SAML/OAuth2 edge cases.
This new iteration checks the base url for redirects only if the
standard CheckServerJob can't reach the server. That way the 2.3
behavior is only changed in cases that would have lead to errors.
See #5954
The problem was that on network error the networkError() and
finishedWithError() signals both fired. To fix it, I collapse all
error handing into a slot triggered by finishedWithError().
I tested the redirection case and the invalid credentials case.
In order to initiate the conneciton, we should not send a GET on the
webdav URL because that is not a valid webdav command on a collection.
Issue #2911
* When folder config is used, other folder definitions are always
removed.
* Fix a bug with the wizard becoming stuck when 'skip folder config'
is used.
* 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.
