Merging in latest from upstream (HDFFV/hdf5:refs/heads/hdf5_1_8)
* commit '6a230585f0380503db2280db0ba069c639bb6103':
Added test Description: Added another test to invoke the Group constructor, taking an Attribute as a location. Platforms tested: Linux/32 2.6 (jam) Linux/64 (platypus)
Removed ObjHeaderIException Description: ObjHeaderIException was just added but it is better to use the existing LocationIException instead to avoid using internal names. Future improvement: use throwException to throw the appropriate exception instead. Platforms tested: Linux/32 2.6 (jam) Linux/64 (platypus) Darwin (osx1010test)
Fixed typos.
Purpose: Add new C++ wrappers (HDFFV-10156) Description: Added wrappers for H5Iis_valid, H5Ps/get_nlinks, H5Tget_create_plist, H5Oopen, and H5Oclose
