vchoi_fork

[svn-r12973] Description:
    Finish removing library's internal code that uses H5G_get_objinfo() and
retarget it at either getting the link information or the object information,
as appropriate.  (Still need to add user-level tests for H5Oget_info(), but
since several internal components of the library depend on the internal version,
it appears to be working correctly).

Tested on:
    FreeBSD/32 4.11 (sleipnir)
    Linux/322.4 (heping)
    Linux/64 2.4 (mir)
    AIX/32 5.? (copper)
    Mac OS X/32 10.4.8 (amazon)