Date arithmetic fixes. Date +/- Interval passes all tests again, after fixing a couple of the tests to actually reflect the calendar used on my planet rather than where-ever Richard was when he wrote the test <wink> The basic problem was that when going backwards, the code was adding the days of the current month, rather than the previous month. There's still a bug in the testDateSubtract that I'll fix next. Bugfix candidate (probably)

Name: classic
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