Re: new *Help* argument highlighting

[Thien-Thi Nguyen]

suggestions:
 - recognize args by all-uppercase.
 - make only the first N instances of the arg stand out.
 - default N is 1, but add a user-defineable function to
        evaluate context and possibly return another number.
 - keep "stand out" as bold.

this makes it easy to locate the general area of an arg's
description, w/o overwhelming decoration, by default, and
at the same time allow programmers who like to explore their
heuristical sensibilities go wild.

thi