Made torps and fighter wobbly. They have a chance of tracking randomly instead of staying straight or seeking if in nebulous terrain. Option is turned on when NEBULA_EFFECT contains PHOTON and/or FIGHTER.

#include <stdarg.h>

/*
 * prototypes for main.c
 */

int main(int argc, char *argv[]);
void err(char *s, ...);
void err_sys(char *s, ...);
void GoAway(int type);