std: Stabilize last bits of io::Error

This commit stabilizes a few remaining bits of the `io::Error` type:

* The `Error::new` method is now stable. The last `detail` parameter was removed
  and the second `desc` parameter was generalized to `E: Into<Box<Error>>` to
  allow creating an I/O error from any form of error. Currently there is no form
  of downcasting, but this will be added in time.

* An implementation of `From<&str> for Box<Error>` was added to liballoc to
  allow construction of errors from raw strings.

* The `Error::raw_os_error` method was stabilized as-is.

* Trait impls for `Clone`, `Eq`, and `PartialEq` were removed from `Error` as it
  is not possible to use them with trait objects.

This is a breaking change due to the modification of the `new` method as well as
the removal of the trait implementations for the `Error` type.

[breaking-change]

src/libstd/sys/common/net2.rs

@@ -75,7 +75,7 @@ fn sockaddr_to_addr(storage: &libc::sockaddr_storage,
             })))
         }
         _ => {
-            Err(Error::new(ErrorKind::InvalidInput, "invalid argument", None))
+            Err(Error::new(ErrorKind::InvalidInput, "invalid argument"))
         }
     }
 }
@@ -158,8 +158,7 @@ pub fn lookup_addr(addr: &IpAddr) -> io::Result<String> {
     match from_utf8(data.to_bytes()) {
         Ok(name) => Ok(name.to_string()),
         Err(_) => Err(io::Error::new(io::ErrorKind::Other,
-                                     "failed to lookup address information",
-                                     Some("invalid host name".to_string())))
+                                     "failed to lookup address information"))
     }
 }
 

src/libstd/sys/unix/net.rs

@@ -35,7 +35,8 @@ pub fn cvt_gai(err: c_int) -> io::Result<()> {
             .to_string()
     };
     Err(io::Error::new(io::ErrorKind::Other,
-                       "failed to lookup address information", Some(detail)))
+                       &format!("failed to lookup address information: {}",
+                                detail)[..]))
 }
 
 impl Socket {