TimeZone is sometimes -120 for unknown reason

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@duschata:

The timezoneOffset tests are running under linux without modifications
To get the green bar under windows, set the system timezone to UTC.
When you pass serveral datas at Calendar.xmlCalendarToDate() and CET timezone, you will see, that all timezoneOffsets
are -60 except you pass a single day. In this case you will recieve -120 as the TZ offset.
Strange behavior, can't explain why.

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@duschata Timezones can't really be handled well with JavaScript's Date. So I've removed timezone handling when printing dates with G*Types. Timezone of the original Date is ignored which I think makes more sense - as normally you don't care about TZ of a xs:gYearMonth etc. If you do, use a calender on input. There's not much alternatives as TZ can't be really set on Date.