search for subscriber should be done on nodeid basis and not reference, only one subscriber per event per nodeid allowed
    not necessarily the same starts and stops...
    +error corrected in ref signal
    added print of error codes + more correct error handling of event errors
    + added goto instead of erroneous break to fix bug#7627


ndb/include/kernel/signaldata/SignalData.hpp:
  added som signal printout functions
ndb/src/common/debugger/signaldata/SignalDataPrint.cpp:
  added som signal printout functions
ndb/src/common/debugger/signaldata/SignalNames.cpp:
  added som signal printout functions
ndb/src/common/debugger/signaldata/SumaImpl.cpp:
  added som signal printout functions
ndb/src/kernel/blocks/suma/Suma.cpp:
  search for subscriber should be done on nodeid basis and not reference, only one subscriber per event per nodeid allowed
  not necessarily the same starts and stops...
  +error corrected in ref signal
ndb/src/ndbapi/NdbDictionaryImpl.cpp:
  indentation
  event error handling
  debug printouts
ndb/src/ndbapi/NdbEventOperationImpl.cpp:
  debug printouts
  + added goto instead of erroneous break to fix bug#7627
ndb/test/src/HugoTransactions.cpp:
  added print of error codes + more correct error handling of event errors