autom4te.cache directory and update the headers of the message files.

into brian-akers-computer.local:/Users/brian/mysql/mysql-4.0

[This patch has already been approved by Serge.  I am recommitting and pushing from a new repository because there were other changesets that couldn't be pushed.]

BUG# 5229 --password=foobar does not override the empty 'password' option in the my.cnf
This is a backport of a change made by jani in the 4.1 tree.

mysql.cc:
  Add tty_password=0 in the p case handling in get_one_option

into rurik.mysql.com:/home/igor/dev/mysql-4.0-0

  Added newline at the end of file.

into mysql.com:/home/mysql_src/mysql-4.0

This does not fix any known bug, but is still a good idea.

into gw.mysql.r18.ru:/usr/home/ram/work/4.0.b2205

into gw.mysql.r18.ru:/usr/home/ram/work/4.0.b2205

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

into mysql.com:/home/mysql_src/mysql-4.0

As I cannot be 100% sure that there won't be issues with some of our exotic platforms
(who knows if the charset of <obscure old OS> will play fair?), I'll send an email to the build guys.
Well, this holds if bk does not crash on binary chars of this cset.

into rhols221.adsl.netsonic.fi:/home/my/bk/mysql-4.0

FLOAT columns".

into gw.mysql.r18.ru:/usr/home/ram/work/4.0.b2631

into mysql.com:/home/mysql_src/mysql-4.0-opt

into mysql.com:/home/mysql_src/mysql-4.0

Dependency fix. We observed that doing any change to class THD in sql_class.h resulted in mysqld going crazy (parsing errors,
query cache errors in query_cache.test). This is because sql_yacc.cc depends on several .h files but those were not listed in
the dependencies of sql_yacc.o. The present patch does fix the issue; but my auto*-expert colleagues may have a better one.

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

(Jani's CS 1.1675 04/01/05 21:45:14 was adapted an aplied).

  Allow FROM or IN in SHOW KEYS, as in other SHOW statements.

into rurik.mysql.com:/home/igor/dev/mysql-4.0-0

  Added a test case for bug #5333.
null_key.result, key_primary.result:
  Made covering index usable for const tables.
sql_select.cc:
  Made covering index usable for const tables:
  downported the corresponding code from 4.1.
  Simultaneously fixed bug #5333 reported for 4.1.
  The bug was due to the fact that field index in join
  structures was always set to 0 for const tables.

  Add GPL comment

into gw.mysql.r18.ru:/usr/home/ram/work/4.0.b5232

into mysql.com:/space/my/mysql-4.0