Remove a large amount of deprecated functionality

Spring cleaning is here! In the Fall! This commit removes quite a large amount
of deprecated functionality from the standard libraries. I tried to ensure that
only old deprecated functionality was removed.

This is removing lots and lots of deprecated features, so this is a breaking
change. Please consult the deprecation messages of the deleted code to see how
to migrate code forward if it still needs migration.

[breaking-change]

src/librustdoc/html/format.rs

@@ -708,9 +708,11 @@ impl fmt::Show for ModuleSummary {
             let path = context.connect("::");
 
             try!(write!(f, "<tr>"));
-            try!(write!(f, "<td><a href='{}'>{}</a></td>",
-                        Vec::from_slice(context.slice_from(1))
-                            .append_one("index.html").connect("/"),
+            try!(write!(f, "<td><a href='{}'>{}</a></td>", {
+                            let mut url = context.slice_from(1).to_vec();
+                            url.push("index.html");
+                            url.connect("/")
+                        },
                         path));
             try!(write!(f, "<td class='summary-column'>"));
             try!(write!(f, "<span class='summary Stable' \