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/parser.sx

@@ -550,7 +550,9 @@
                                 (list
                                   (quote not)
                                   (list (quote eq-ignore-case) left right)))
-                              (list (quote not) (list (quote =) left right)))))))
+                              (list
+                                (quote not)
+                                (list (quote hs-id=) left right)))))))
                     ((match-kw "empty") (list (quote empty?) left))
                     ((match-kw "less")
                       (do