ABC is making a drastic change to Dancing with the Stars for next fall.   The network has announced that it will no longer air the reality series on two nights per week.  Instead. it is folding the Dancing wit the Stars results show into the competition's performance show as part of a two-hour block on Monday nights.  ABC has traditionally aired a one-hour Dancing with the Stars results show on Tuesdays, one night after the performance show.   The network says it hopes to boost it's overall ratings for Mondays.