BY DAVE BARRY (This classic Dave Barry column was originally published Dec. 31, 2000.) Today's topic for homeowners is: how to install a tile floor. Any home decorator will tell you that there is nothing quite like a tile floor for transforming an ordinary room into an ordinary room that has tile on the floor. But if you're like most homeowners, you think that laying tile is a job for the ''pros.'' Boy, are you ever stupid! Because the truth is that anybody can do it! All it takes is a little planning, the right materials and a Fire Rescue...