#6559 "DROP DATABASE forgets to drop triggers".

If we drop table we should also drop all triggers associated with it.
To do this we have to check for existence of .TRG file when we are 
dropping table and delete it too.

provide created shared memory objects with proper
access rights to make them usable when client and server
are running under different accounts. 
Post review fixes.

into zim.(none):/home/brian/mysql/mysql-5.0

into zim.(none):/home/brian/mysql/mysql-4.1

into mysql.com:/home/jimw/my/mysql-5.0-clean

into mysql.com:/home/jimw/my/mysql-4.1-clean

into mysql.com:/home/jimw/my/mysql-4.1-clean

into mysql.com:/home/jimw/my/mysql-5.0-clean

into eagle.intranet.mysql.r18.ru:/home/bar/mysql-5.0

  Don't run GBK test if not GBK support was compiled.

  Moving UCS2 test into ctype_ucs
  Bug#9232 Test failure: mysql_client_test and type_newdecimal

into eagle.intranet.mysql.r18.ru:/home/bar/mysql-5.0

into gluh.mysql.r18.ru:/home/gluh/MySQL-BUGS/mysql-5.0.8941

into gluh.mysql.r18.ru:/home/gluh/MySQL-MERGE/mysql-5.0

  -skip the print of 'MAX_ROWS=#' for 'SHOW CRETAE TABLE' with information schema tables 

  post-merge fix.
  ,

into zim.(none):/home/brian/mysql/mysql-4.1

into neptunus.(none):/home/msvensson/mysql/mysql-4.1

into mysql.com:/home/jimw/my/mysql-5.0-clean

  result update (default value changed from 4.1 to 5.0)

into quadita2.mysql.com:/nfstmp1/guilhem/mysql-5.0-4ita

  Wrong help string fix.

into mysql.com:/usr/home/bar/mysql-4.1

in some cases, because "charset(x) = 'string'" was considered
as "x is not null" due to incorrect not_null_tables().

  there was no check of result of 
  table->file->write_row() function. When count of rows was
  more than table max_rows(HEAP table) the following recodrs
  were not inserted to the table
  -'schema_table_store_record' function is added. 
    The function checks result of write_row function
    and convert HEAP table to MyISAM if necessary
  - Result check after write_row is added into all 
    I_S function which store the records to I_S tables