I considered it, but it doesn’t necessarily fit the “lightweight” criterion. Also, the Wiki markup is pretty alien to most of my colleagues, while Markdown is basically in their fingers already.
Gergely Polonkai I wasn't sure what footprint exactly you're trying to avoid with "lightweight". Learning curve? CPU/RAM usage? Maintenance effort? Is it a problem if there are unused features, or if it has a lot of lines of code?
Both maintenance effort and learning curve are important factors. I don’t necessarily mind unused features, but it’s good to keep in mind that any feature, used or not, can be an attack vector (even if this system will be an internal only one)