FIX Director::is_absolute_url() now ignores query and fragment strings

Director::is_absolute_url() checks for //. It used to include the
entire URI, now it ignores the query and fragment strings.
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Merge remote-tracking branch 'origin/master' into translation-staging
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BUG: Allow using instances for search filters.

Previously search filters could only be specified as strings, this
allows instances to be used so more complex filter configuration
can be used.
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