A few updates

I added a link to the oft-mentioned blog software I've been working on, in the model railroad section. It's focus has been either model railroading or itself, so it makes sense to put it there.

Also, I updated the module construction page with a note about Ntrak. It seems you can follow those steps and get an Ntrak-ready module. (Ntrak-ready means you still have to lay track and everything.)