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Latest and greatest from Transifex.

Fixes issue #38. Since there now is filescanning in the settings
module, use that to detect potential problems and warn the user about it.
The problem is of course again that such problematic symlink could be
added by the user after having created the backup plan. Again, it's a
trade off, don't want to do more filescanning than necessary.

Fixes issue #39. Allow user to include (and as a bug fix, also exclude)
folders which the user does not have read permission for. Add filescanning
in the background to detect access permission problems for both files and
folders, then show error message to user about the problem.
This is not a perfect solution, but the best compromise I could think of.
With this solution error message is only displayed during
configuration.
The main problem with that is if unreadable files are added after the
backup plan is created then taking a new backup will fail but no simple
error message.

It seems the root item gets locked, can't get expanded or collapsed. So it
needs to be expanded on creation otherwise it remains collapsed and can't be
expanded by user. Useless.
Also clean up code a bit for the logic to expand to show selected folders.

Makes it clearer what is going on when reading the code.

That way the user can copy the commands and paste to his shell and execute
the same without problems with spaces in paths.

A user reported that his USB 3 harddrive shows up under SATA bus as
removable but not hotpluggable (according to solid, it is of course hotpluggable)
Change to show such devices also, don't think this change will cause any
false positives.

Before it would get stuck forever in "backup running" state. Now it aborts and displays to the user why.

Pressing reset button after having changed number of plans left the apply button enabled before.

Also, don't try to check content... no way for QMimeDatabase to access repo data, need kio for that.

Since daemon will not run after user has upgraded, no point to put migration there. Instead, user will have to open settings, things will get migrated then.

It was not shown in the Qt 4 days, let's not show it now either.

Also sneak in a nicer way to launch kup-filedigger.