• Add hast to USERS_BLACKLIST [1].
• Add USE_READLINE knob [2].
• Fix typo [3].

PR: ports/157128 [1]
PR: ports/162995 [2]
PR: ports/165125 [3]

Submitted by: Ruslan Mahmatkhanov <cvs-src@yandex.ru> [1],
fjoe [2], "Conrad J. Sabatier" <conrads@cox.net> [3]