hdf5doc

Purpose:
    Bugfixes 
Description:
    H5Pget_fclose_degree (634)
    H5Pset_allocate_time and H5Pget_allocate_time (643)
    H5Zfilter_avaible (635)
        Fixed return type (tri_t) and description (Boolean).
    H5Piterate (642)
        Resolved and removed reviewer's query.
        Corrected typo in H5P_iterate_t prototype.
    Closes Bugzilla entries 634, 635, 642, and 643.
Platforms tested: 
    Safari