Problem #1: INSERT...SELECT, Version for 5.1.
Extended the unique table check by a check of lock data.
Merge sub-tables cannot be detected by doing name checks only.


mysql-test/r/create.result:
  BUG#5390 - problems with merge tables
  Removed a duplicate test.
mysql-test/r/merge.result:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT
  Added test results.
mysql-test/t/create.test:
  BUG#5390 - problems with merge tables
  Removed a duplicate test.
mysql-test/t/merge.test:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT
  Added tests.
sql/lock.cc:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added a new function to find a duplicate lock in a list of tables.
sql/mysql_priv.h:
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added the thread handle to unique_table().
  Added a declaration for the new function.
sql/sql_base.cc:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added the thread handle to unique_table().
  Added a call to the new mysql_lock_have_duplicate(),
  which needs the thread handle, to unique_table().
sql/sql_delete.cc:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added the thread handle to unique_table().
sql/sql_insert.cc:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added the thread handle to unique_table().
sql/sql_load.cc:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added the thread handle to unique_table().
sql/sql_parse.cc:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added the thread handle to unique_table().
sql/sql_update.cc:
  BUG#5390 - problems with merge tables
  Problem #1: INSERT...SELECT, Version for 5.1.
  Added the thread handle to unique_table().
  Replaced a call to find_table_in_local_list() by
  the newly extended unique_table().