Fix bug when using option groups

Fix for --enable-local-infile
Portability fix for bison

Fix problem with HAVING and MAX() IS NOT NULL

into serg.mysql.com:/usr/home/serg/Abk/mysql-4.0

into sinisa.nasamreza.org:/mnt/hdc/Sinisa/mysql-4.0

  Update
costarica.txt, costarica.gif, costarica.eps:
  new file

into sinisa.nasamreza.org:/mnt/hdc/Sinisa/mysql-4.0

accomodate EXPLAIN properly for all possible variant of UNION's
derived tables etc ...

This also fixes all reported (and unreported) bugs when EXPLAIN is
run on UNION's.

select_describe() now has a very dirty hack to avoid some problems
with transactional tables on table unlocking.

Code speedup is possible. For the moment all that was important was
that all tests are passed.

reference manual for O'Reilly.

  Script that takes the relative values in the 
  colspec tags and converts them to absolute values.

changeset - afaik, I can edit changesets with bk. So, rather than wait, I will
commit this now, finish up the other code, try to alter the changeset and then
push all the changes up.

into serg.mysql.com:/usr/home/serg/Abk/mysql-4.0

manual: News updated

  qsort implementation backported from 4.0 tree, the old one was buggy

into sinisa.nasamreza.org:/mnt/hdc/Sinisa/mysql-4.0

  Experiment

  @uref fix-ups
include.de.texi:
  new file

  new file

into co3064164-a.bitbike.com:/home/arjen/mysql-4.0

into sinisa.nasamreza.org:/mnt/hdc/Sinisa/mysql-4.0