//  Format of a TDirectory record in release 3.02.06.  It is never compressed.
// ----------TKey--------------
//  byte 0->3  Nbytes    = Number of bytes in compressed record (Tkey+data)           TKey::fNbytes
//       4->5  Version   = TKey class version identifier                              TKey::fVersion
//       6->9  ObjLen    = Number of bytes of uncompressed data                       TKey::fObjLen
//      10->13 Datime    = Date and time when record was written to file              TKey::fDatime
//                       | (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
//      14->15 KeyLen    = Number of bytes in key structure (TKey)                    TKey::fKeyLen
//      16->17 Cycle     = Cycle of key                                               TKey::fCycle
//      18->21 SeekKey   = Byte offset of record itself (consistency check)           TKey::fSeekKey
//      22->25 SeekPdir  = Byte offset of parent directory record                     TKey::fSeekPdir
//      26->26 lname     = Number of bytes in the class name (10)                     TKey::fClassName
//      27->.. ClassName = Object Class Name ("TDirectory")                           TKey::fClassName
//       0->0  lname     = Number of bytes in the object name                         TNamed::fName
//       1->.. Name      = lName bytes with the name of the object <directory name>   TNamed::fName
//       0->0  lTitle    = Number of bytes in the object title                        TNamed::fTitle
//       1->.. Title     = lTitle bytes with the title of the object <direcory title> TNamed::fTitle
// --------DATA----------------
//       0->0  Modified  = True if directory has been modified                        TDirectory::fModified
//       1->1  Writable = True if directory is writable                               TDirectory::fWriteable
//       2->5  DatimeC   = Date and time when directory was created                   TDirectory::fDatimeC
//                       | (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
//       6->9  DatimeM   = Date and time when directory was last modified             TDirectory::fDatimeM
//                       | (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
//      10->13 NbytesKeys= Number of bytes in the associated KeysList record          TDirectory::fNbyteskeys
//      14->17 NbytesName= Number of bytes in TKey+TNamed at creation                 TDirectory::fNbytesName
//      18->21 SeekDir   = Byte offset of directory record in file                    TDirectory::fSeekDir
//      22->25 SeekParent= Byte offset of parent directory record in file             TDirectory::fSeekParent
//      26->29 SeekKeys  = Byte offset of associated KeysList record in file          TDirectory::fSeekKeys
