local flag in ndbapi to set -O2 since problems occur with -O3
pc.hpp, Emulator.hpp, Emulator.cpp, ErrorReporter.cpp:
  USE_EMULATED_JAM -> !NO_EMULATED_JAM
ErrorReporter.hpp:
  removed NDEBUG and removed THREAD_ASSERT
Dbdict.cpp:
  NDB_DEBUG -> VM_TRACE
configure.in:
  cleaned up ndb CXX flags and added optional flag possibility