Erma Bombeck - Another Christmas season bites the dust (Editor's Note: The following column is one of 195 included in ''Forever, Erma'' (Andrews and McMeel), a recently published collection of the best-loved writing from America's favorite humorist, Erma Bombeck. This column originally appeared Jan. 1, 1987.) You say you've had enough people around to last you a lifetime? You say if you don't get some time to yourself you may start braiding your hair and humming? You'd like to clear everyone out of the house and be able to have some quiet time alone? Read my lips and slowly repeat after me: ''I am going to take the Christmas tree down.'' You will only have to say it once and feet will scurry, doors will slam, car motors will turn over. In 30 seconds you'll feel like the last person on Earth. No one loves a Christmas tree on Jan. 1. The wonderful soft branches that the family couldn't wait to get inside to smell have turned int