Remove unneeded dependencies, start work on csv parsing

src/lib.rs

@@ -88,9 +88,8 @@ pub fn move_money_2(
     initial_totals: HashMap<Unit, f64>,
     rules: &Vec<MovementRule>,
 ) -> HashMap<Unit, f64> {
-    // TODO: Should probably validate that all the rules have departments that actually exist in initial_totals.
-    // Note: It's potentially a bit more intensive to use cloned totals, but it's much simpler code and, and since we're only working line-by-line
-    // it isn't really that much memory. in practice
+    // Note: It's potentially a bit more intensive to use cloned totals (rather than just update temp_total per rule),
+    // but it's much simpler code and, and since we're only working line-by-line, it isn't really that much memory in practice
     let mut running_total = HashMap::from(initial_totals);
     let mut temp_total = running_total.clone();
     for rule in rules {
@@ -135,11 +134,9 @@ pub enum DepartmentType {
     Overhead,
 }
 
-// TODO: Could also look at BigDecimal rather than f64 for higher precision (even i64 might be fine if we don't need to divide...)
 // Note: remember these are overhead departments only when calculating the lu decomposition or pseudoinverse, and for each department,
 // you either need -1 or rest negative for a row to subtract the initial amounts so we end up effectively 0 (simultaneous equations end
 // up with negative there so yes this is expected)
-// Also, we could potentially use this same struct for non-overhead departments when mapping from overhead to
 pub struct OverheadAllocationRule {
     from_overhead_department: String,
     to_department: String,