MRG: clearer message for manysketch (#121)

* clearer reporting

* rustfmt

* upd println

src/manysketch.rs

@@ -187,7 +187,7 @@ pub fn manysketch<P: AsRef<Path> + Sync>(
             // progress report at threshold
             if i != 0 && i % reporting_threshold == 0 {
                 let percent_processed = ((i as f64 / n_fastas as f64) * 100.0).round();
-                eprintln!("Processed {} fasta files ({}% done)", i, percent_processed);
+                eprintln!("Starting file {}/{} ({}%)", i, n_fastas, percent_processed);
             }
 
             let mut data: Vec<u8> = vec![];