Removed not used variable 'last_ref'

Fixed problem with negative DECIMAL() keys
Fixed some bugs with NULL keys in BDB
More mysql-test tests


Docs/manual.texi:
  Changelog
client/mysqltest.c:
  Added syntax:  -- error #,#,...
heap/hp_info.c:
  cleanup
include/thr_lock.h:
  cleanup
isam/pack_isam.c:
  cleanup
myisam/mi_check.c:
  cleanup
myisam/mi_extra.c:
  cleanup
myisammrg/myrg_rkey.c:
  cleanup
mysql-test/mysql-test-run.sh:
  Change to run test as root
mysql-test/r/bdb.result:
  Many new tests
mysql-test/r/func_system.result:
  Change to root user
mysql-test/t/bdb.test:
  many more tests
mysql-test/t/create.test:
  Change to work by test and root user
sql/field.cc:
  Fixed problem with negative DECIMAL() keys
sql/filesort.cc:
  cleanup
sql/ha_berkeley.cc:
  Added purecoverage notes
  Fixed some bugs with NULL keys
sql/init.cc:
  cleanup
sql/mysql_priv.h:
  cleanup
sql/mysqld.cc:
  cleanup
sql/records.cc:
  cleanup
sql/unireg.h:
  cleanup

mysql-test/mysql-test-run.sh

@@ -10,7 +10,6 @@
 # Access Definitions
 #--
 DB=test
-DBUSER=test
 DBPASSWD=
 VERBOSE=""
 TZ=GMT-3; export TZ # for UNIX_TIMESTAMP tests to work
@@ -209,6 +208,9 @@ fi
 if [ -n "$USE_RUNNING_SERVER" ]
 then
    MASTER_MYSOCK="/tmp/mysql.sock"
+   DBUSER=test
+else
+   DBUSER=root		# We want to do FLUSH xxx commands
 fi
 
 if [ -w / ]