Used by the routines at PLAYER_LEGS and TOP_FOLLOWS_LEGS.

Turns the object into graphic 48, the first frame of the sparkle, and takes it out of the collision tests (bit 1 of its flags); SPARKLE_STEP runs it on through 49 to 54 a frame a turn, and SPARKLE_END_PLACE's graphic 55 ends it. Used by the robot's update routines (PLAYER_LEGS, TOP_FOLLOWS_LEGS) when he dies. Knight Lore's init_death_sparkles; Pentagram's START_PUFF.