Do not print candidates in status lines when in secure mode.
Closes #713 although we could improve this by printing the
"components" just like in a crack, eg:
`1g 0:00:00:00 DONE 2/3 (2014-08-12 21:46) 100.0g/s 101200p/s 101200c/s 101200C/s L6-?d..L6-?l`