Comment 19 for bug 1175906

Just to clarify, my suggestion in #16 was based in part off similar non-breaking password transition recommendations Solar Designer made in the wake of the major signedness issue fixed in crypt_blowfish 1.1 ( http://www.openwall.com/lists/announce/2011/06/21/1 ) but was mainly brought up for the sake of completeness. I really have little context for whether such a transition plan would be of interest to havana adopters.