Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop)
* commit '712a2a13d8add828d053135a172abb2e819d59ad':
Fixed a warning in H5CX.c concerning incorrect use of freeing VOL connector info.
Add H5S_SEL_ITER_SHARE_WITH_DATASPACE selection iterator creation flag, to share dataspace's selection with iterator (and with caution about not modifying or closing the dataspace while the iterator is open).
Fix misc. typos, etc. from code review
New hyperslab selection routines and new public selection iterator routines.
