Added key cache assignment
mi_locking.c:
  Added key cache assignment: correction
my_sys.h:
  Added key cache variable structure

  Added mi_keycache.c

  new file
Many files:
  Added CACHE INDEX command

args[0] is used instead. This allowed to resuse a lot of code.

into bar.mysql.r18.ru:/usr/home/bar/mysql-4.1

into mysql.r18.ru:/usr/home/ram/work/4.1

It's now passed as args[0]. This fix allowed to resuse a lot of code.

into mysql.r18.ru:/usr/home/ram/work/4.1

into teton.kitebird.com:/home/paul/mysql-4.1

into myvenu.com:/home/venu/work/sql/dev-4.1

if some of the arguments is STRING_RESULT the STRING_RESULT
else if some of the arguments is REAL_RESULT then REAL_RESULT
else INT_RESULT 

into sergbook.mylan:/usr/home/serg/Abk/mysql-4.1

into myvenu.com:/home/venu/work/sql/dev-4.1

Added PURGE BINARY LOGS as synonym for PURGE MASTER LOGS.
Removed PURGE LOGS (now PURGE MASTER LOGS).
Added SHOW BDB LOGS as synonym for SHOW LOGS.
Note: tests key_cache.test hanged, rpl_log_pos.test, rpl_rotate_logs.test failed for me.
For the second and third one I guess this will disappear after merging 4.0.

into sergbook.mylan:/usr/home/serg/Abk/mysql-4.1

  Data was not converted when ALTER TABLE CHAGE changed a field character set.

into teton.kitebird.com:/home/paul/mysql-4.1

   the server error messages had been modified in errmsg.txt

into mashka.mysql.fi:/home/my/mysql-4.1

into ice.snake.net:/Users/paul/mysql-4.1

into mashka.mysql.fi:/home/my/mysql-4.1

into gluh.mysql.r18.ru:/home/gluh/mysql-4.1.DTFUNC

into myvenu.com:/home/venu/work/sql/dev-4.1

into gluh.mysql.r18.ru:/home/gluh/mysql-4.1.DTFUNC