Refactoring, Quickfix improvements
separated xquery.js from (new) quickfix.js
quickfix now has the shortcut ctrl-(shift|alt)-q
if multiple annotations are present on the same line, a gutter click opens the quickfix-popup for the first one, a shortcut-press opens the quickfix for the annotation left of or containing the cursor
the quickfixpopup now appears below the code to be quickfixed