Reorganized quantities

src/tokens/function.rs

@@ -2,7 +2,7 @@ use std::collections::VecDeque;
 
 use crate::tokens::Token;
 use crate::tokens::Operator;
-
+use crate::quantity::QuantBase;
 
 #[derive(Debug)]
 #[derive(Copy, Clone)]

src/tokens/operator.rs

@@ -4,6 +4,7 @@ use std::cmp::Ordering;
 use crate::tokens::Token;
 use crate::tokens::Function;
 use crate::quantity::Quantity;
+use crate::quantity::QuantBase;
 
 /// Operator types, in order of increasing priority.
 #[derive(Debug)]