Investigate use of NLog instead of the homegrown logging code.

NLog is much nicer and supports levels/timing and more, but I'm not sure if it can be added without having to configuire the IIS web application globally.

Maybe it's not a problem to do that, so this warrants some investigation.

If it is possible to create a local logging context/loggers in Nlog and use that, it could probably be drop in replacement for the current logging code.