Make calendar widget look more mac'ish

http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/XHIGControls/chapter_18_section_3.html

Scroll to the very end to see how its supposed to look.

It would be really awesome if you can make it for 4.2 but I am not sure we have the time. What I suggest is that we make sure we have all the style stuff in place for 4.2 and fix it for 4.2.1.
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The display of dates, editing etc is very different from the current QCalendarWidget (See the attchements ). Some differences are listed below
1) The year is not editable. (There is no edit control corresponding to it, have to select by press next/previous month buttons )
2) The month is only editable through the arrow buttons (No menu shown)
3) Does not show the dates in previous/next months
4) A new button to go to the current date

Its better to move this to a Major release
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