.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.