move cht module up a level

ethcore/light/src/cht.rs

@@ -20,3 +20,8 @@ pub const SIZE: u64 = 2048;
 pub fn block_to_cht_number(block_num: u64) -> u64 {
 	(block_num + 1) / SIZE
 }
+
+/// Get the starting block of a given CHT.
+pub fn start_number(cht_num: u64) -> u64 {
+	(cht_num * SIZE) + 1
+}

ethcore/light/src/client/header_chain.rs

@@ -28,7 +28,7 @@
 
 use std::collections::{BTreeMap, HashMap};
 
-use client::cht;
+use cht;
 
 use ethcore::block_status::BlockStatus;
 use ethcore::error::BlockError;

ethcore/light/src/client/mod.rs

@@ -39,8 +39,6 @@ use self::header_chain::HeaderChain;
 
 pub use self::service::Service;
 
-pub mod cht;
-
 mod header_chain;
 mod service;
 

ethcore/light/src/lib.rs

@@ -33,6 +33,7 @@
 #![deny(missing_docs)]
 
 pub mod client;
+pub mod cht;
 pub mod net;
 pub mod on_demand;