Seperate blocks in /admin/features. (#5345)

* Seperate blocks in /admin/features.

Its hard to distinguish between blocks of settings in the features page. Its
useful to clearly mark the blocks belonging together.

* Also try to separate items for other themes.

* Make sure separate settings boxes work in all themes.

view/theme/duepuntozero/style.css

@@ -2721,9 +2721,7 @@ aside input[type='text'] {
 }
 
 .settings-block {
-	border: 1px solid #AAA;
-	margin: 10px;
-	padding: 10px;
+	border-bottom: 1px solid #AAA;
 }
 
 .app-title {

view/theme/quattro/dark/style.css

@@ -2551,6 +2551,9 @@ footer {
 #adminpage .selectall {
   text-align: right;
 }
+.settings-block {
+  border-bottom: 1px solid #cccccc;
+}
 /* edit buttons for comments */
 .icon.dim {
   opacity: 0.3;