OpenRefine / OpenRefine / #4294

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master: 50%

Pull #4295

Fix date parsing to avoid offsets due to DST.

This pull request comes without tetsts because there is no clean way
to set the system timezone in a Java unit test:
https://stackoverflow.com/questions/23466218/setting-timezone-for-maven-unit-tests-on-java-8

The problem came from the fact that we were interpreting all dates with the current
zone *offset*, which varies during the year depending on DST, meaning that during the winter
we would interpret summer dates in a winter timezone, which does not make sense.
This changes the date conversion mechanism to only rely on the current zone, making sure
the correct offset is used depending on the value of the converted date.

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