added documentation for file open flags; added flags to h5pt_openr_par_align(); added H5PartSetViewEmpty() and h5pt_setview_empty() calls for creating empty hyperslab selections (previously kludge was to use H5PartSetViewIndices with a null list); fixed memory leak with file open flags in the Fortran interface; fixed missing statement in 1.6.x logic for _H5Part_have_group()