trigger on c & 0xC0, then loop on utf-8 stanzas until we hit
something else, but keep track of width and stop printing if
we run out of space in the middle of a string of > U+007F
characters.
exist on plan9) and `grep` (with appropriate backslashing) instead
of `fgrep` (`fgrep` doesn't exist on plan9) or `grep -F` (`-F` option
doesn't exist on plan9?)
2. move the source for `echo` and `cols` into the new `tools` directory.