Remove overzealous code that was causing dropdowns to be misaligned with their anchor nodes.  For above/below dropdown we want to account for width of top and bottom borders, but not adjust for left/right borders.   Before/after popups aren't important enough to adjust for at all.
   
 Also tweak Tooltip template so that dijit/place doesn't take the tooltip's border into account when positioning the tooltip.   Since the border isn't adjacent to the around node, it's not relevant to the calculations.
 
 Finally, fix typos where the border adjustment code was adjusting aroundNodePos.t instead of aroundNodePos.y.  Fixes failures on IE10 in Tooltip-placement.html.
 
 Refs #10631 !strict.