hdf5_ep

[svn-r29364] Purpose: Improve C++ Packet Table library
Description:
    Performed similar improvement as the C Packet Table library.
      - Removed the VLPT_REMOVED ifdef around class VL_PacketTable
      - Moved VL_PacketTable::IsVariableLength to PacketTable
      - Moved VL_PacketTable::FreeReadBuff to PacketTable::FreeBuff
      - Added overloaded constructor to FL_PacketTable that takes a
        property list ID and call the new C API H5PTcreate.
      - Added accessor wrappers to class PacketTable, per HDFFV-8623/patch 003.
            /* Returns the ID of the dataset associated with the packet table */
            hid_t GetDataset();

            /* Returns the ID of the datatype the packet table uses */
            hid_t GetDatatype();
      - Replaced appropriate calls in tests
      - Various cleanup
Platforms tested:
    Linux/32 2.6 (jam)
    Linux/64 (platypus)
    Darwin (osx1010test)