tabularize parameter lists and tone down parameter list title

[SVN r25384]

doc/html/boostbook.css

@@ -72,6 +72,24 @@ i.firstterm
    font-weight: bold;
 }
 
+/* tone down the title of Parameter lists */
+div.variablelist p.title
+{
+   font-weight: bold;
+   font-size: 100%;
+   text-align: left;
+   background-color: white;
+}
+
+/* tabularize parameter lists */
+div.variablelist dl dt
+{
+   float: left;
+   clear: left;
+   width: 10%;
+   font-style: italic;
+}
+
 @media screen
 {
    a{ color: blue; }