gfse&minibar: fix bug caused by function name clash

+ Function div_id was defined in both editor.js and support.js. Solution:
  moved the more general version from editor.js to support.js.
+ Function div_class was defined in both editor.js and support.js. Solution:
  resolv incompatibility with an argument type test and put the generalized
  function in support.js.

src/www/gfse/editor.js

@@ -1387,8 +1387,6 @@ function touch_edit() {
 }
 /* --- DOM Support ---------------------------------------------------------- */
 
-function div_id(id,cs) { return node("div",{id:id},cs); }
-function div_class(cls,cs) { return node("div",{"class":cls},cs); }
 function a(url,linked) { return node("a",{href:url},linked); }
 function ul(lis) { return node("ul",{},lis); }
 function li(xs) { return node("li",{},xs); }

src/www/minibar/support.js

@@ -143,13 +143,15 @@ function empty(tag,name,value) {
 function empty_id(tag,id) { return empty(tag,"id",id); }
 function empty_class(tag,cls) { return empty(tag,"class",cls); }
 
-function div_id(id) { return empty_id("div",id); }
+function div_id(id,cs) { return node("div",{id:id},cs); }
 function span_id(id) { return empty_id("span",id); }
 
 function wrap(tag,contents) { return node(tag,{},[contents]); }
 
 function wrap_class(tag,cls,contents) {
-    return node(tag,{"class":cls},contents ? [contents] : [])
+    return node(tag,{"class":cls},
+		contents ? Array.isArray(contents) ? 
+		contents : [contents] : [])
 }
 
 function span_class(cls,contents) { return wrap_class("span",cls,contents); }