Docs refreshed

I've just committed a bunch o' patches for the docs. Changes include:

o a chapter on index cost estimating (indexcost.sgml) from Tom Lane.
o a chapter on the PL/perl language from Mark Hollomon.
o a chapter on queries and EXPLAIN from Tom Lane.
o lots of other bits and pieces.

One change was to separate the docs for PL/SQL, PL/TCL, and PL/perl
into separate chapters, moving them to the User's Guide, and moving
the "How to interface a language" to the Programmer's Guide. istm that
these easy to use programming languages come close to being a
user-accessible feature (hence placing them in the UG), much more so
than, say, libpq. Comments?

- Thomas

(sent at Thu Mar 30 22:41 UTC 2000)

--
Thomas Lockhart lockhart(at)alumni(dot)caltech(dot)edu
South Pasadena, California