Update to v4.2.1

Fix speed report in case --machine-readable is used

Make words_buf_r in DES bitsliced kernels __constant

Final v4.0.1 commit

Do not use run_kernel_memset() for password candidate initialization …

…in autotune

Mark release for production

Remove some debugging printf() call

Fixed overflow in bcrypt kernel in expand_key() function

Update readme.txt for SHA-224

Fix some leftover spaces when experimenting with restrict keyword