.vidjil: better document `top` and/or make it optionnal
In https://github.com/ablab/y-tools/commit/41687407b738436b2c05615afa24548f83fbc595#diff-dfa29d568694d4d8189ce3e61b44972dR79
@eodus assigns a "top": 1 for every clone. We are doing almost the same in vidjil-algo (json_clone["top"] = 0).
It looks like that the actual top value used in the client is then computed by fuse.py. We should investigate and better document the value.
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