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writes _all_ or _no_ metadata!!!

SUGGESTION: whenever taking up new pics in database, write metadata in pics
and/or database in background. 

Maybe, one should be able to configure this item in settings. For my opinion,
this is just a short retardation in working speed- neglectible. 

One could use caches to do this job in the background. Not embarrassing the
user.

There are several mechanisms to achieve this. 


Reproducible: Always

Steps to Reproduce:
It is a WISH

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