NOJIRA Add DPX and IPTC metadata extraction to GraphicsMagick plugin

I could have sworn this wasn’t supported back when we first implemented
GraphicsMagick support, but it seems to be now.
NOJIRA Change the way we store IPTC in the metadata array to make it easier (or at all possible) to extract it via media_metadata.conf
NOJIRA Fix access control issue
PROV-947 Fixed problem where dates with month names containing umlauts would be rejected as invalid.

As it turns out, the first thing being done in the TimeExpressionParser
is running the incoming string through caRemoveAccents() to remove most
things non-ASCII. Well, the language configuration has to reflect that
which was not the case for de_DE. This is fixed now and I also added a
test for this.
Merge branch 'master-fix' into develop

Conflicts:
	app/lib/ca/BaseFindController.php
	tests/lib/core/Parsers/TimeExpressionParserTest.php