Fix another item in the "A few bugs" mail. Monsters who wanted to flee
weren't able to use 'sstairs' (extra stairway leading to different branch
of dungeon) due to a logic error in the find_defensive() choices.
if (terrain==STAIR) {
} else if (terrain==LADDER) {
} else if (x==sstairs.sx && y==sstairs.sy) {
} else { /* check traps */
}
wouldn't find 'sstairs' because they have terrain type STAIRS. (Also,
the sstairs check wasn't screening out immobile monsters, but that bug
didn't have a chance to manifest.)
There's a bunch of reformatting, and some code re-organization to improve
other formatting, and some additional logic fixes.
b2dd4bb410