against "unknown obstacle"
Pull request #746 by entrez: give better feedback when 'F' prefix
is used toward furniture covered by objects and towards solid rock
terrain on arboreal levels.
Fixes #746
while riding would give impossible warning "no monster to remove"
the change to protect Rider corpses from being destroyed by exploding chests
inadvertently prevented them from being used up when Riders revived
+force-fight against furniture covered by an object described the attack as
+ missing an unknown obstacle
curses: 'msg_window' option wasn't functional for curses unless the binary
also included tty support