Add QAspectRatioLayout borrowed from http://wiki.forum.nokia.com/index.php/CS001309_-_Maintaining_square_form_for_a_widget_in_Qt to maintain width == height * 2 aspect ratio for map drawing widget

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[patterns]

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**.h = native

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**.c = native

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**.cpp = native

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**.lua = native

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**.txt = native

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**.pas = native

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**.inc = native