Update to nl_NL translation from Cherif Ben Brahim.

Signed-off-by: Cherif Ben Brahim
Update translators.
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Missing <iostream> include.  From Markus Kalb.
Merge branch 'master' of ssh://main.carlh.net/home/carl/git/dcpomatic
Another missing <iostream> include from Markus Kalb.
Fix windows package.
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Fix thinko causing checked_set (wxSpinCtrlDouble) not to work.
Merge branch 'master' of ssh://main.carlh.net/home/carl/git/dcpomatic
Bump version
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Merge master.