remove unused code

amodem/errors.py

@@ -1,22 +0,0 @@
-#!/usr/bin/env python
-import bitarray
-import sys
-
-tx_fname, rx_fname = sys.argv[1:]
-tx = bitarray.bitarray()
-tx.fromfile(open(tx_fname))
-
-rx = bitarray.bitarray()
-rx.fromfile(open(rx_fname))
-
-L = min(len(tx), len(rx))
-if L == 0:
-    sys.exit(1)
-
-rx = rx[:L]
-tx = tx[:L]
-errors = (rx ^ tx).count(1)
-total = L
-ber = float(errors) / total  # bit error rate
-print('BER: {:.3f}% ({}/{})'.format(100 * ber, errors, total))
-sys.exit(int(errors > 0))