Expose H5Pset_obj_track_times object creation property

[ddemidov]

HDF5 tracks object access/modification times, which in general makes any two files with identical contents differ byte-wise. This PR allows to disable/enable time tracking for datasets. This, for example, may help to reduce disk space when files are stored in a key-value store, where key is derived by hashing the file contents.

To illustrate the idea:

• With time tracking (the default behavior):

h5open("a.h5", "w") do f
    f["y"] = [1, 2, 3]
end
h5open("b.h5", "w") do f
    f["y"] = [1, 2, 3]
end

md5sum a.h5 b.h5
d85cfc58cce44f08efc7ab360d48016f  a.h5
51c6fa2b556b73911a5e4479853c5ce5  b.h5

• Without time tracking:

h5open("a.h5", "w") do f
    f["y", "track_times", false] = [1, 2, 3]
end
h5open("b.h5", "w") do f
    f["y", "track_times", false] = [1, 2, 3]
end

9e1b6badd6152d65871dc4dc8bfb2dd1  a.h5
9e1b6badd6152d65871dc4dc8bfb2dd1  b.h5

[musm]

add tests?

[ddemidov]

Done