Updates to it_IT translation from William Fanelli.
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Fix some coverity-reported stuff.
Merge.
Add missing i18n attribution.
Apparently .deb builds need a README.
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Add basic stuff to build RPMs for Centos.

Suggested-by: Manuel Weber
Bump libdcp to get some fixes for Interop XML

Reported-by: Ivan Pullman
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Bump libdcp to fix windows build.
Merge branch 'master' of ssh://carlh.dyndns.org/home/carl/git/dcpomatic
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More windows build fixes.
Merge branch 'master' of ssh://carlh.dyndns.org/home/carl/git/dcpomatic
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