CleverRaven/Cataclysm-DDA — pull request #7756 by MattAmmann (2014-05-26 12:46:25+00:00)
Title: Disallow using roadmaps underground

Fixes #7744

Technical note: `overmapbuffer::reveal(const point ¢er, int radius, int z) ` doesn't update the overmap the way it should if z = 0 when the player is on any level other than 0. That's a bit outside the scope of this fix, but I don't think it's WAI.