[tex-eplain] tentative eplain version 2.8.1a

[Dorai Sitaram]

I've packaged eplain-2.8.1a which includes Oleg's patch
(\setpropertyglobal) and some changes to the part of
the document that deals with indexes.  (In addition to
mentioning how to make subsub...entries, I corrected
the spelling of some of the indexing commands to
match what was actually defined in eplain.tex.  E.g.,
\idxrangebeginword, \idxseecmdword.)

>     BTW, I wonder why eplain needed to have special
>     syntax for the first subentry.  The ! mechanism is
>     fully general...
> 
> As I recall, my thought was to avoid hardwiring the ! character, in case
> some document wanted to use something else.  My feeling was the number
> of indexes with subsubentries is miniscule (and seems like the index
> must be very complex indeed to warrant using it).
 
One would think so, but when I turned to the index in
the public-library (i.e., rather mainstream) book I
am currently reading, Oliver Sacks's _The Island of the
Colorblind_, what do I see at the very top but

achromatopsia
  acquired (cerebral), 5-6
  ...
  and color
    cerebral evocation of, 225-6
    curiosity about, 19-20, 22, 218
    &c

!