HS: DOM ref-eq + compound selector + DOM tree fixes

- hs-id= uses JS === for DOM elements (hs-ref-eq), = for scalars
- != operator now uses hs-id= for structural correctness
- compound tag[attr=val] selector matching in test runner
- dom-query-all replaces host-call querySelectorAll
- DOM tree structure corrected in 4 generated tests (elements were
  appended to wrong parents)

lib/hyperscript/compiler.sx

@@ -1148,6 +1148,11 @@
                     (quote =)
                     (hs-to-sx (nth ast 1))
                     (hs-to-sx (nth ast 2))))
+                ((= head (quote hs-id=))
+                  (list
+                    (quote hs-id=)
+                    (hs-to-sx (nth ast 1))
+                    (hs-to-sx (nth ast 2))))
                 ((= head (quote +))
                   (list
                     (quote hs-add)