We all make mistakes. But as this editor can firmly attest, we often rely on our most trusted commenters to save us from our small foibles. Apparently, so do the contributors at the Post’s D.C. Wire blog — DCist commenter extraordinaire and local blogger IMGoph spotted this gem on a post about yesterday’s gas leak at Thomas Elementary School in Northeast: Pointing out that schools do not, in fact, operate on a six-day schedule: another…