compile error/warning fixes
added force of heartbeat
added ability to force heartbeat


ndb/src/common/mgmcommon/LocalConfig.cpp:
  added possibility to use comma-separated connectstring
ndb/src/common/mgmcommon/NdbConfig.c:
  compile error/warning fixes
ndb/src/mgmsrv/MgmtSrvr.cpp:
  added force of heartbeat
ndb/src/mgmsrv/main.cpp:
  changed help text
ndb/src/ndbapi/ClusterMgr.cpp:
  added ability to force heartbeat
ndb/src/ndbapi/Ndbinit.cpp:
  added comment