added my_pthread_init to get dbug print correct in Hugo
    added define for event error code



ndb/examples/ndbapi_event_example/ndbapi_event.cpp:
  updated event example to make use of new NdbError member in NdbEventOperation
  + use define to check error code
ndb/include/kernel/signaldata/CreateEvnt.hpp:
  updated create event signal to use define
ndb/include/ndbapi/NdbEventOperation.hpp:
  added NdbError member to NdbEventOperation
ndb/include/ndbapi/ndberror.h:
  added define for event error code
ndb/src/kernel/blocks/dbdict/Dbdict.cpp:
  changed name of error code
ndb/src/ndbapi/NdbEventOperation.cpp:
  added NdbError
ndb/src/ndbapi/NdbEventOperationImpl.cpp:
  added debug printout
  added some error handling
ndb/src/ndbapi/NdbEventOperationImpl.hpp:
  added NdbError
ndb/src/ndbapi/Ndberr.cpp:
  added NdbError for NdbEventOperationImpl
ndb/src/ndbapi/ndberror.c:
  changed some error codes
ndb/test/ndbapi/test_event.cpp:
  added testcase for BUG#7627
ndb/test/src/HugoTransactions.cpp:
  added printout in event
ndb/test/src/NDBT_Test.cpp:
  added my_pthread_init to get dbug print correct