Dropping support for -a 4 permutation-attack

[D3ad0ne]

Atom just to be sure I'll also run some test on some highly worked list. With the ability to still use it as a stdin component it won't completly be dropped. The only reason I could think of that would justify keeping it in is if you could use it with rules, or some other attack mode.

[Rolf]

I never really used permutation attack, but if you'd discontinue it, how about having a special "last version which supported permutation attack" somewhere?
Like in the old versions archive.