Update stdlib, compiler, and tests to new kind system

This involved adding 'copy' to more generics than I hoped, but an
experiment with making it implicit showed that that way lies madness --
unless enforced, you will not remember to mark functions that don't
copy as not requiring copyable kind.

Issue #1177

src/test/stdtest/task.rs

@@ -68,7 +68,7 @@ fn test_join_convenient() {
 #[ignore]
 fn spawn_polymorphic() {
     // FIXME #1038: Can't spawn palymorphic functions
-    /*fn foo<uniq T>(x: T) { log_err x; }
+    /*fn foo<send T>(x: T) { log_err x; }
 
     task::spawn(true, foo);
     task::spawn(42, foo);*/