Don't bother optimising codegen (slower over all).

--HG--
extra : rebase_source : 9e2c65de79eca17d86199b7a40ee8bf0417eddd6
Derive Clone in a macro (now possible).

--HG--
extra : rebase_source : 851499a80287cb8d2271bb9d00c9844a22f8e77e
Remove or comment out unused statics.

--HG--
extra : rebase_source : afadb20cac073a3a0654a407e8a41bbe61db9818
Add a note about Rust 0.9 support.