Use qualified path instead of alias

It is more typical in this repo to use `module::Error` instead of a type
alias when importing.

Use `hex::Error` directly instead of `use hex::Error as HexError`.

Author: tcharding

src/blockdata/constants.rs

@@ -23,7 +23,7 @@ use prelude::*;
 
 use core::default::Default;
 
-use hashes::hex::{HexIterator, Error as HexError};
+use hashes::hex::{self, HexIterator};
 use hashes::sha256d;
 use blockdata::opcodes;
 use blockdata::script;
@@ -99,7 +99,7 @@ fn bitcoin_genesis_tx() -> Transaction {
     });
 
     // Outputs
-    let script_bytes: Result<Vec<u8>, HexError> =
+    let script_bytes: Result<Vec<u8>, hex::Error> =
         HexIterator::new("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f").unwrap()
             .collect();
     let out_script = script::Builder::new()