GPII-163: Adjusted the document order of the DT

Moved the Discovery Tool higher up in the DOM order to implement the desired tab order. This couldn't be achieved with straight tabindex values since UIO uses an iframe and the tab indexes of this would be calculated separate from the parent document. This would have caused the tab focus to jump back to the top of the page after tabbing away from the open/close button on the panel.

Also removed a call to fluid("tabable") as it was unneeded and caused issues in firefox when trying to set tabindexes of 1 or higher.
Merge remote-tracking branch 'jobara/GPII-163'

* jobara/GPII-163:
  GPII-163: Adjusted the document order of the DT
GPII-198: Apply "more text" only to article images. Also removed the demands block that supplies the iframe html src.
GPII-198: Removed the constraint on excluding next, previous, thumb up/down icons since they are all outside of the <article>.
GPII-198: Get rid of the demands block for adjusting the image selector in moreText enactor.
Merge remote-tracking branch 'cindy/GPII-198'

* cindy/GPII-198:
  GPII-198: Get rid of the demands block for adjusting the image selector in moreText enactor.
  GPII-198: Removed the constraint on excluding next, previous, thumb up/down icons since they are all outside of the <article>.
  GPII-198: Apply "more text" only to article images. Also removed the demands block that supplies the iframe html src.