fixes

src/bin/simulator.rs

@@ -1,8 +1,6 @@
 // Standard library
 use std::error::Error;
-use std::fs::File;
 use std::fs;
-use std::io::BufReader;
 use std::path::Path;
 use std::time::{Duration,Instant};
 
@@ -14,7 +12,7 @@ use humantime;
 
 // Internal modules from the library crate
 use orbital_simulator::simulation::Simulation;
-use orbital_simulator::types::{norm_time, real_body};
+use orbital_simulator::types::norm_time;
 use orbital_simulator as _; // for mod resolution
 
 #[derive(Parser, Debug)]