hdf5_ep

[svn-r2555] Purpose:
     Added source files for the Stream Virtual File Driver.

Description:
     The Stream VFD allows users to stream complete HDF5 files
     via socket connections between different applications.

     Files which were created anew are flushed to any connected client
     on each H5Fflush() or H5Fclose() operation.
     Files which are opened as read-only will be read from a socket
     on a H5Fopen() call.

     The driver's H5FDset_fapl_stream() routine allows to pass in
     several parameters such as an external socket descriptor,
     some socket options, and flags for broadcasting a received file.
     If an external socket is provided the Stream VFD would use that
     for the socket calls. Otherwise it parses the filename argument
     in H5Fcreate()/H5Fopen() for a 'hostname::port' parameter.

     All files processed by the Stream VFD are kept in memory
     (same way as the core VFD does).

Platforms:
     Tested so far under Linux, Irix 32/64bit, OSF1, Solaris, Cray Unicos,
     Hitachi SR8000, IBM AIX.
     Not tested under Windows yet.