Minor cleanup pass on touch.
Update README for pending directory, include list of code outside of pending (grandfathered) awaiting cleanup.
Cleanup pass on README.

Other versions are adding Cached from /proc/meminfo to free buffers/cache
(and subtracting it from used), but sysinfo() doesn't provide it. (But it
provide "high memory", which hasn't been relevant for almost a decade...)
But that's a design change, not a cleanup issue.