Remove 'Spurious change' message, along with log crate which is no lo…

…nger needed

Cargo.toml

@@ -16,4 +16,3 @@ license = "MIT / Apache-2.0"
 keywords = ["constraint", "simplex", "user", "interface", "layout"]
 
 [dependencies]
-log = "0.3"

src/lib.rs

@@ -229,9 +229,6 @@ use std::sync::Arc;
 use std::collections::HashMap;
 use std::collections::hash_map::{Entry};
 
-#[macro_use]
-extern crate log;
-
 mod solver_impl;
 mod operators;
 

src/solver_impl.rs

@@ -314,8 +314,6 @@ impl Solver {
                 if old_value != new_value {
                     self.public_changes.push((v, new_value));
                     var_data.0 = new_value;
-                } else {
-                    info!("Spurious change");
                 }
             }
         }