Add numeric accounts as property to lib, redistribute floating point errors for each account in overhead allocation

src/lib.rs

@@ -80,6 +80,7 @@ pub extern "C" fn allocate_overheads_from_text(
     areas: *const c_char,
     cost_centres: *const c_char,
     account_type: *const c_char,
+    use_numeric_accounts: bool,
 ) -> *mut c_char {
     let lines = unsafe {
         assert!(!lines.is_null());
@@ -113,7 +114,7 @@ pub extern "C" fn allocate_overheads_from_text(
         csv::Reader::from_reader(areas.to_bytes()),
         csv::Reader::from_reader(cost_centres.to_bytes()),
         &mut output_writer,
-        true,
+        use_numeric_accounts,
         false,
         true,
         account_type.to_str().unwrap().to_owned(),