KeeperFX: Tux Edition 1.4.0.5653

Replaces 1.4.0.5652. One fix on top of it and nothing else:

• Positioned script messages no longer wear random icons. DISPLAY_INFORMATION_WITH_POS(text, x, y)
  fed its y coordinate to the custom-icon parser — an upstream slip in the custom-icon feature, and
  get_icon_id on a number is just atoi — so a message placed at y=154 showed the alarm-trap
  lightning bolt, at y=112 the Hold Audience gate, at y=55 the guard post: the wrong picture, drawn
  at its own size, spilling out of the message column and blinking while unread. Found in a tutorial
  map; every map that places information messages was affected. The icon is read only for the form
  that takes one.

Saved games from 1.4.0.5652 load unchanged; the game-state layout is untouched.