Implement tree states & hierarchical state DB

lcli/src/skip_slots.rs

@@ -55,7 +55,7 @@ use std::fs::File;
 use std::io::prelude::*;
 use std::path::PathBuf;
 use std::time::{Duration, Instant};
-use types::{BeaconState, CloneConfig, EthSpec, Hash256};
+use types::{BeaconState, EthSpec, Hash256};
 
 const HTTP_TIMEOUT: Duration = Duration::from_secs(10);
 
@@ -121,7 +121,7 @@ pub fn run<T: EthSpec>(env: Environment<T>, matches: &ArgMatches) -> Result<(),
     };
 
     for i in 0..runs {
-        let mut state = state.clone_with(CloneConfig::all());
+        let mut state = state.clone();
 
         let start = Instant::now();