Added coverId to Dialog allowing to modal out a single node versus entire page

[tk]

As the description says... this allows for passing an id to Dialog widget via coverId="myNode" and the dialog will cover that node only... even if the dialog is bigger than the node... it will center itself over it

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Patch to allow dialog over node instead of entire page

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Ugh... upon testing of this... the BG is sized and positioned incorrectly in IE... weird since I used dojo.style for almost all of the positioning values... Any help in sorting this out is greatly appreciated (I dont use IE)

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Fixed problem with underlay displaying wrong

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Fixed the weird problem noticed in IE... strange thinks happen when you cross Height with Width's... This now works BETTER with IE than with FF due to FF not treating considering overflowed content in getOuterWidth() while IE encapsulates overflow as part of the element.

With FF if you have a element that is narrow with lots of text that displays down and overflows.... your dialog will position above it and your underlay will NOT cover the overflow where in IE this is covered and the dialog will center over the overflow as if it were a natural part of the element.

[bill]

I don't think we want this as part of Dijit, sorry. It would add too much complication for PopupManager?, etc.