Proper management of scroll bars in the left (west) pane.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@2093 a333f486-631f-4898-b8df-5754b55c2be0

css/light-grey.css

@@ -815,6 +815,7 @@ div#right {
 }
 div#menu {
 	width: 100%;
+	overflow: auto;
 }
 .header-menu {
 	padding-left: 24px;