[TYPO3-core] Display thumbnails by default

[Xavier Perseguers]

Hi,

> You should consider updating the issue subject and the commit message to
> specify *which* thumbnails or setting you are referring to, as there are
> lots of different kinds of thumbnails shown throughout the TYPO3 backend
> (a reference to the User Setting "thumbnailsByDefault" somehow).

I found a weird timeout problem with a few PDF files in fileadmin. Did
not investigate yet but turning thumbnails off temporarily "fixed" the
problem.

-- 
Xavier Perseguers
Release Manager TYPO3 4.6

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