Move flush back to common.

src/common.rs

@@ -34,3 +34,8 @@ macro_rules! xx {
 		From::from(From::from($x))
 	}
 }
+
+pub fn flush(s: String) {
+	::std::io::stdout().write(s.as_bytes()).unwrap();
+	::std::io::stdout().flush().unwrap();
+}

src/standard.rs

@@ -27,8 +27,3 @@ pub use rustc_serialize::hex::{FromHex, FromHexError};
 
 pub use heapsize::HeapSizeOf;
 pub use itertools::Itertools;
-
-pub fn flush(s: String) {
-	::std::io::stdout().write(s.as_bytes()).unwrap();
-	::std::io::stdout().flush().unwrap();
-}