hdf5

[svn-r17414] Description:
	Flush the core VFD's buffer before closing the file, also flush the
metadata accumulator before reseting it.  Write the driver info message out
in the superblock flush routine more directly, instead of using wrapper
routine, since the wrapper routine won't work when the superblock is being
shutdown.

Tested on:
        FreeBSD/32 6.3 (duty) in debug mode, w/check-vfd
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode, w/check-vfd
        Linux/32 2.6 (kagiso) w/PGI compilers, w/C++ & FORTRAN, w/threadsafe,
                                in debug mode, w/check-vfd
        Linux/64-amd64 2.6 (smirom) w/Intel compilers w/default API=1.6.x,
                                w/C++ & FORTRAN, in production mode, w/check-vfd
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                                w/szip filter, in production mode, w/check-vfd
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                                in production mode, w/check-vfd
        Linux/64-ia64 2.4 (tg-login3) w/parallel, w/FORTRAN, in production mode, w/check-vfd
        Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in production mode, w/check-vfd
        Mac OS X/32 10.5.8 (amazon) in debug mode, w/check-vfd
        Mac OS X/32 10.5.8 (amazon) w/C++ & FORTRAN, w/threadsafe,
                                in production mode, w/check-vfd