mysql-test/r/innodb.result:
  result added
mysql-test/t/innodb.test:
  testcase
sql/ha_myisam.cc:
  HA_CAN_RTREEKEYS added to ha_myisam
sql/handler.h:
  HA_CAN_RTREEKEYS defined
sql/share/errmsg.txt:
  error message added
sql/sql_table.cc:
  check that the handler allows SPATIAL keys