std: Rename {Eq,Ord} to Partial{Eq,Ord}

This is part of the ongoing renaming of the equality traits. See #12517 for more
details. All code using Eq/Ord will temporarily need to move to Partial{Eq,Ord}
or the Total{Eq,Ord} traits. The Total traits will soon be renamed to {Eq,Ord}.

cc #12517

[breaking-change]

src/libstd/ascii.rs

@@ -23,7 +23,7 @@ use to_str::{IntoStr};
 use vec::Vec;
 
 /// Datatype to hold one ascii character. It wraps a `u8`, with the highest bit always zero.
-#[deriving(Clone, Eq, Ord, TotalOrd, TotalEq, Hash)]
+#[deriving(Clone, PartialEq, PartialOrd, TotalOrd, TotalEq, Hash)]
 pub struct Ascii { chr: u8 }
 
 impl Ascii {