MDL-40987 ajax script ready for the question bank dialogue.
MDL-43089 quick hack to make the qbank popup populate when shown.
MDL-43089 link in the qbank now work.
MDL-43089 Make the create question button in the qbank work.
MDL-43089 fix changing qbank display options.
MDL-43089 loading indicator when loading the next page of the question bank.
MDL-43089 clean up CSS a bit.
MDL-43089 update URL when qbank options change.
MDL-43089 fix scroll when qbank visibile.
MDL-43089 make add to quiz icons work.