[TYPO3-media] Replaced tt_content.image field with FAL variant

[Ingmar Schlecht]

Hi guys,

just so you know, in the last commit in the project-fileabstraction 
branch on the Incubator I just changed the tt_content.image field to be 
the FAL based one (instead of adding the FAL field as an additional one 
as it was done for testing earlier).

As the next step, I will work on getting the images form that field to 
display in the Frontend with the correct alt / title / caption texts.

cheers
Ingmar