files. Also mention that this feature is not enabled by default
and that they must be enabled by compile-time options.
Fixed another typo or two I noticed while I was at it.
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.