[TUHS] custom NS and NE man(7) macros

[Douglas McIlroy]

> You didn't say, but I reckon this is a survey of man(7) macros that
> might be considered extensions?

My presentation was too cute for my own good. I pointed out the
consistency of xS/xE for various x. I apologized for EX/EE, which
varied from that form (as UR/UE did more recently), and I
questioned OQ/CQ, which utterly breaks it.

The intended point was that one should have a strong rationale
for deviating from established custom, and thereby fostering
mental overload.

Doug