After merge fixes

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


include/hash.h:
  Added back function that's was used in 4.0
mysql-test/r/delete.result:
  Update results after merge
mysql-test/r/flush_table.result:
  Update results after merge
mysql-test/r/func_str.result:
  Update results after merge
mysql-test/r/handler.result:
  Update results after merge
  Change is big becasue in MySQL 4.1 you are not allowed to qualify the handler alias with a databasename
mysql-test/r/multi_update.result:
  More startup cleanups
mysql-test/r/rename.result:
  More startup-cleanups
mysql-test/r/select.result:
  More startup cleanups
mysql-test/r/show_check.result:
  More startup-cleanups
mysql-test/t/ctype_latin1_de.test:
  Cleanup
mysql-test/t/derived.test:
  Portability fix
mysql-test/t/handler.test:
  Update results after merge
  Change is big becasue in MySQL 4.1 you are not allowed to qualify the handler alias with a databasename
mysql-test/t/multi_update.test:
  More startup cleanups
mysql-test/t/range.test:
  More comments
mysql-test/t/rename.test:
  More startup cleanups
mysql-test/t/select.test:
  More startup cleanups
mysql-test/t/show_check.test:
  More startup cleanups
mysql-test/t/type_timestamp.test:
  Add back test deleted during merge
sql/item_cmpfunc.cc:
  After merge fixes
sql/item_func.cc:
  Remove compiler warning
sql/mysql_priv.h:
  After merge fixes
sql/mysqld.cc:
  After merge fixes
sql/sql_acl.cc:
  More debugging
sql/sql_base.cc:
  After merge fixes
  (This fix was needed bacause of multi-table-update reopens tables)
sql/sql_handler.cc:
  After merge fixes
sql/sql_lex.h:
  After merge fixes
sql/sql_select.cc:
  After merge fixes
sql/sql_show.cc:
  After merge fixes
sql/sql_table.cc:
  After merge fixes
  Simple cleanup of mysql_discard_or_import_tablespace
sql/sql_update.cc:
  After merge fixes
  Rework mysql_multi_update to take into account derived tables.
sql/sql_yacc.yy:
  After merge fixes

include/hash.h

@@ -57,6 +57,7 @@ my_bool hash_update(HASH *hash,byte *record,byte *old_key,uint old_key_length);
 void hash_replace(HASH *hash, uint idx, byte *new_row);
 my_bool hash_check(HASH *hash);			/* Only in debug library */
 
+#define hash_clear(H) bzero((char*) (H),sizeof(*(H)))
 #define hash_inited(H) ((H)->array.buffer != 0)
 
 #ifdef	__cplusplus