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Instead of using the dbus interface of resuces to get the passwords

Differential Revision: https://phabricator.kde.org/D6207

* Fix parsing of "NO {123}" (followed by error lines). The thread separation
broke Volker's "feedback" hack^H^H^H^Hdesign, because the state is wrong at the
time the reparsing happens. This syntax is now handled during response parsing
rather than being fed back to the thread.

* Fix double messagebox on error, because on destruction the job would call
killJob which would emit the error again. To fix this I followed more closely
the KJob API (even though SieveJob isn't a KJob), using the (currently unused)
KillVerbosity argument.

* Fix some error messages being stored in Session and never shown, now those
are given to the current job. This also goes closer to KJob: errorString()
in the job rather than an errorMessage signal.

* Finally, remove messageboxes shown by the job itself (and setInteractive(false)
to disable that), let the caller show a messagebox on error if it wants to
(again, more like KJob). This fixes ugly reentrancy problems while the msgbox
is up from within the job code, and allows to customize the error messages better.

Differential Revision: https://phabricator.kde.org/D2189

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http://community.kde.org/Frameworks/GitOldHistory

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Branched from the monolithic repo, kdepim master branch, at commit
d0009536f24e8c7f4cc32a70936f5c25194e9a6f