ndb/src/kernel/blocks/dbdict/DictLock.txt:
  NR signals
ndb/src/kernel/blocks/dbdict/Dbdict.cpp:
  call removeStaleDictLocks at right place, comment why it works
  more checks, better logging
ndb/src/kernel/blocks/dbdict/Dbdict.hpp:
  call removeStaleDictLocks at right place, comment why it works
  more checks, better logging
ndb/include/kernel/signaldata/DictLock.hpp:
  2 more REFs
ndb/include/ndb_version.h.in:
  DICT LOCK appeared in 5.0.23
ndb/src/kernel/blocks/dbdih/DbdihMain.cpp:
  DICT LOCK rolling upgrade from version < 5.0.23
ndb/src/kernel/blocks/ERROR_codes.txt:
  more DICT LOCK related testing
ndb/test/ndbapi/testDict.cpp:
  more DICT LOCK related testing