duplicate fields removed, st_mysql_storage_engine added to support
run-time handlerton initialization (no compiler warnings), handler API
is now tied to MySQL version, handlerton->plugin mapping added
(slot-based), dummy default_hton removed, plugin-type-specific
initialization generalized, built-in plugins are now initialized too,
--default-storage-engine no longer needs a list of storage engines
in handle_options().

mysql-test-run.pl bugfixes


include/mysql/plugin.h:
  added st_mysql_storage_engine
  made handlerton tied to MySQL version
mysql-test/mysql-test-run.pl:
  bugfixes (umask, --no-defaults)
mysql-test/r/ndb_dd_basic.result:
  update error message
mysql-test/t/partition_mgm_err2.test:
  fix typo
sql/ha_berkeley.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_berkeley.h:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_federated.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_heap.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_innodb.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_innodb.h:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_myisam.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_myisammrg.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_ndbcluster.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_ndbcluster.h:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/ha_ndbcluster_binlog.cc:
  no 'name' in the handlerton anymore
sql/ha_partition.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/handler.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  handlerton->plugin mapping
sql/handler.h:
  handlerton cleanup: remove duplicate fields
sql/log.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
sql/mysql_priv.h:
  handler.h needs plugin.h
sql/mysqld.cc:
  Convert --default-storage-engine to a handlerton* when
  all storage engines are initialized and not in getopt
sql/set_var.cc:
  no name in the handlerton anymore
sql/sql_parse.cc:
  no default_hton anymore
sql/sql_partition.cc:
  no name in the handlerton anymore
sql/sql_plugin.cc:
  generalize plugin type-specific initialization.
  initialize built-in plugins too
sql/sql_plugin.h:
  generalize plugin type-specific initialization.
sql/sql_show.cc:
  st_mysql_storage_engine structure
  no name in the handlerton anymore
sql/sql_table.cc:
  no name in the handlerton anymore
  no default_hton anymore
sql/sql_tablespace.cc:
  no name in the handlerton anymore
  no default_hton anymore
sql/sql_yacc.yy:
  no default_hton anymore
  issue "unknown storage engine" warning where it is discovered
storage/archive/ha_archive.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
storage/archive/ha_archive.h:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
storage/blackhole/ha_blackhole.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
storage/csv/ha_tina.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings
storage/example/ha_example.cc:
  handlerton cleanup: remove duplicate fields, add st_mysql_storage_engine,
  initialize handlerton run-time to avoid compiler warnings