Enabled ordered scan in handler



ndb/include/ndbapi/NdbIndexScanOperation.hpp:
  Moved saveBound to NdbIndexScanOperation
ndb/include/ndbapi/NdbScanOperation.hpp:
  Moved saveBound to NdbIndexScanOperation
ndb/src/ndbapi/NdbDictionaryImpl.cpp:
  Introduced map for
  index attributes (keys) -> real attr id (and back)
ndb/src/ndbapi/NdbDictionaryImpl.hpp:
  Introduced map for
  index attributes (keys) -> real attr id (and back)
ndb/src/ndbapi/NdbOperationDefine.cpp:
  Moved saveBound to NdbIndexScanOperation
ndb/src/ndbapi/NdbOperationInt.cpp:
  Moved saveBound to NdbIndexScanOperation
ndb/src/ndbapi/NdbScanOperation.cpp:
  Moved saveBound to NdbIndexScanOperation
  Fixed bugs in handling of setBounds w.r.t getValues and index keys
    (use new reverse map)
  Fixed bugs in next_result_ordered
sql/ha_ndbcluster.cc:
  Use sorted scan when requested