Add search support in the doxygen docs

doc/searchOverrides.css

@@ -0,0 +1,45 @@
+/* Override search/search.css rules to adjust seach box placement */
+#MSearchBox {
+    position: relative;
+    display: block;
+    border-radius: 0;
+    box-shadow: none;
+    border-width: 1px;
+    border-color: #BBB;
+    border-style: solid;
+}
+.right #MSearchClose {
+    margin: 0;
+    right: auto;
+}
+#MSearchResultsWindow {
+    background-color: #EAF5DB;
+    border-color: #999;
+}
+#MSearchResults > .SRPage {
+    background-color: #EAF5DB;
+}
+a.SRSymbol {
+    color: rgb(70, 100, 30);
+}
+a.SRSymbol:hover {
+    text-decoration: underline;
+}
+a.SRScope {
+    color: rgb(70, 100, 30);
+}
+a.SRScope:hover {
+    text-decoration: underline;
+}
+#MSearchSelectWindow {
+    background-color: #EAF5DB;
+}
+#MSearchSelectWindow > a.SelectItem {
+    color: #333;
+    text-decoration: none;
+}
+#MSearchSelectWindow > a.SelectItem:hover {
+    color: white;
+    background-color: #8CC841;
+    text-decoration: none;
+}