(for Date_time docs) .screen in tables shouldn't get margins and borders

[SVN r33535]

doc/html/boostbook.css

@@ -54,6 +54,14 @@
         padding: 0.5pc 0.5pc 0.5pc 0.5pc;
     }
 
+    /* Program listings in tables don't get borders */
+    td .programlisting, 
+    td .screen
+    {
+        margin: 0pc 0pc 0pc 0pc;
+        padding:  0pc 0pc 0pc 0pc;
+    }
+
 /*=============================================================================
     Headings
 =============================================================================*/
@@ -389,6 +397,12 @@
             border: 1px solid #DCDCDC;
         }
     
+        td .programlisting, 
+        td .screen
+        {
+            border: 0px solid #DCDCDC;
+        }
+    
     /* Blurbs */
         div.note,
         div.tip,
@@ -457,6 +471,12 @@
             border: 1px solid gray;
         }
     
+        td .programlisting, 
+        td .screen
+        {
+            border: 0px solid #DCDCDC;
+        }
+    
     /* Table of contents */
         .toc
         {