Last week, WTOP was guesstimating that as many as 2,000 to 3,000 port-a-potties were being ordered to place around the city for Inauguration Day, but today the Post gets the scoop on the actual number: 5,000! Yes, 5,000 portable toilets will be installed along the parade route and around the National Mall, more than double the 2,200 provided in 2005. We’ll say one good thing about the likelihood that it’s going to be a cold day in Washington on January 20 — at least the smell of all that human waste has a good chance of being tamped down by freezing temperatures.