fix for #4216. css now ignores negative numbers for width and height when passed an object of props and vals.

width, height, scrollLeft, and scrollTop now work with windows and documents other than just the one it was loaded in (like iframes and popups)

Unified the formatting of core.js. === or !== are used wherever appropriate, syntax has been normalized, braces are added in all cases, and jQuery() now returns an empty set.

Backed out commit [6260], was causing too many problems. We'll have to bite the bullet and assume that the incoming result set has array methods. Un-fixes jQuery bug #4250.

Removed the objectAll check from jQuery.support, was causing problems with broken ActiveX controls. Fixes bug #4017.

Simplified the structure of the .css() and .attr() methods (reducing the number of calls). Need to optimize $.css/$.curCSS/$.attr still. Fixes #4269.

No longer use arguments.callee or RegExp (use new RegExp, instead) for ES 3.1 and Caja compatibility. Fixes jQuery bug #4251.

As it turns out, the context was being started at a higher root than needed - fixing this speeds up > selectors.