Some bug fixes

[dickermoshe]

1. Africa/Khartoum that had a transition from 11:59:59 to 13:00:00 on Jan 15, 2000. Previously, we would return the incorrect time because we were creating a ZonedDateTime for 12:00 and then adding n hours to it. However, THERE IS NO 12:00 on Jan 15, 2000. Java automatically bumps the ZonedDateTime to 13:00. Chatzos is returned an hour later than it should.

Failing Test Case

TestCase {
        year: 2000,
        month: 1,
        day: 15,
        latitude: 21.743167270756928,
        longitude: 27.55334330024661,
        elevation: 486.715389268106,
        timezone: "Africa/Khartoum",
        preset_name: "getFixedLocalChatzos",
        ateret_torah_sunset_offset_minutes: 23,
        candle_lighting_offset_minutes: 36,
        use_astronomical_chatzos_for_other_zmanim: false,
        use_elevation: false,
}

2. Previously, going back a single month from AdarII would skip AdarI and go directly to Sivan.
3. Added a single iteration to improve noon accuracy