Some bigger code changes was necessary becasue of the multi-table-update and the new HANDLER code

Noteworthy:
- New HANDLER code
- New multi-update-grant-check code
- Table lock code in ha_innodb.cc was not applied

into gw.mysql.r18.ru:/usr/home/ram/work/4.0.b5733

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

Cleaned up patch for checking locks for multi-table updates

into mysql.com:/home/dlenev/src/mysql-4.1-bf

introduced during implementation of TIMESTAMP columns, which are able 
to store NULLs (Unfortunately it is impossible to write test case for
this. Kudos to Holyfoot for noticing it!)

into deer.(none):/home/hf/work/mysql-4.1.5730

  Fix typos in previous push

into hundin.mysql.fi:/home/heikki/mysql-4.1

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

into deer.(none):/home/hf/work/mysql-4.0

Recusive part leads to stack overflow

into hundin.mysql.fi:/home/marko/k/mysql-4.0

  Raise maximum column prefix len to 767 bytes, so that MySQL can create a column prefix index of 255 UTF-8 characters (each takes 3 bytes at the maximum); add comments about why innobase_get_at_most_n_mbchars() works ok
dict0mem.h:
  Raise maximum column prefix len to 767 bytes, so that MySQL can create a column prefix index of 255 UTF-8 characters (each takes 3 bytes at the maximum)
row0mysql.c:
  If MySQL tries to create a column prefix index longer that 255 UTF-8 characters, give an error, and drop the table from the InnoDB internal data dictionary. MySQL did not drop the table there in its own error handling.

into hundin.mysql.fi:/home/marko/j/mysql-4.1

into hundin.mysql.fi:/home/marko/k/mysql-4.0

into sinisa.nasamreza.org:/mnt/work/mysql-4.0

into hundin.mysql.fi:/home/marko/j/mysql-4.1

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

into mysql.com:/home/mydev/mysql-4.0-bug4286

removed staus flag

Bug #5492 
"set @@session.read_rnd_buffer_size=33554432" crashes server on query

1. added warning comments for uint3korr (need one more byte allocated)
2. unsigned long in uint3korr was replaced by unsigned int to 
   avoid problems on 64-bits platforms
3. shorten warning comments in init_rr_cache in sql/records.cc

  Fix compiler warning

into mysql.com:/home/dlenev/src/mysql-4.1-ryan

into eagle.mysql.r18.ru:/home/vva/work/BUG_5492/mysql-4.0

into mysql.com:/M41/mysql-4.1

into mysql.com:/home/dlenev/src/mysql-4.1-ryan