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Apparently mrvdb has problems with duplicate inserts and missing files when
unlinking. It could be due to coding, or it could be due to parallelizing.

We're also now using $config['image']['jpegquality'] to determine the
quality setting for resized images.

To set Avatar max size, adjust $config['avatar']['maxsize']

The getAvatar call now throws exceptions too. Related changes applied.
Now let's move Profile->avatarUrl to the Avatar class!

This will return a proper DB_DataObject instance (as the desired class)
and not an array, or ArrayWrapper.

getUser calls are much more strict, and one place where this was found was
in the (un)subscribe start/end event handlers, which resulted in making the
Subscription class a bit stricter, regarding ::start and ::cancel at least.
Several minor fixes in many files were made due to this.

This does NOT touch the Foreign_link function, which should also have a more
strict getUser call. That is a future project.

Incorrectly said this was for nudging, not subbing/unsubbing