getOffsetCoords [APE.dom Meta refactoring]

[GarrettS]

position-f.js:

• Move isAboveElement, isBelowElement, isInsideElement to a separate file, allowing these methods to use any getCoords function that returns an {x:number, y:number} object.
• Create new test file for said test functions.
• Rename file to getOffsetCoords.js and update all references in workspace (do a search), including build.xml, suite.html, etc (do a search).