hdf5_ep

[svn-r20539] Description:
	Bring Coverity changes back to trunk:

r20276:
Add recursive is vlen string function.
Cleanup resource leaks for issues: 200,202,329,688,811,812


r20277:
Check types and close by adding error section: issue 687


r20278:
Replaced implicit pointer conversion with (ocrt_info.new_obj != NULL).


r20280:
Addressed coverity issues 927-929 & 583.  The real issue is failure to check 
file name length -- at least at the H5FD interface level.  This needs more work, but at least I have dealt with the issue in H5FDfamily.c


r20337:
H5O_type_t  obj_type = H5O_TYPE_UNKNOWN;


r20338:
Added udata.name = NULL; to prevent potential uninitialized use after done: label.


r20339:
coverity issues: 686,828,1670-1673,1707-1711


Tested on:
        FreeBSD/32 6.3 (duty) in debug mode
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode
        FreeBSD/32 8.2 (loyalty) w/gcc4.6, in debug mode
        FreeBSD/64 8.2 (freedom) w/gcc4.6, in debug mode
        Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x,
                w/C++ & FORTRAN, w/threadsafe, in debug mode
        Linux/64-amd64 2.6 (amani) w/Intel compilers, w/default API=1.6.x,
                w/C++ & FORTRAN, in production mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                w/szip filter, w/threadsafe, in production mode
        Linux/PPC 2.6 (heiwa) w/C++ & FORTRAN, w/threadsafe, in debug mode
        Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in debug mode