Fix the tracking of progress in block number about arbore-qt HOT 4 OPEN

It's likely due to the fonts directory being linked twice in the graph.

(image generated with go-ipfs/bin/graphmd QmXX7YRpU7nNBKfw75VG7Y1c3GwpSAGHRev67XVPgZFv9R | dot -Tpng > /tmp/ui.png)

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I guess the best strategy is a cache of instanciated Object where we can query instance before creating a new one.

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It is due to an inconsistency in the ipfs API.
The issue ipfs/kubo#1554 was opened.

$ ipfs refs -r QmXX7YRpU7nNBKfw75VG7Y1c3GwpSAGHRev67XVPgZFv9R|grep QmUYndb1SkY49khYAg9Zn2yp9Z44cRFtqMnVAZP5qes8ce
$ ipfs get QmXX7YRpU7nNBKfw75VG7Y1c3GwpSAGHRev67XVPgZFv9R
(should dl all the files returned by the ipfs refs -r command)
$ curl http://127.0.0.1:5001/api/v0/refs/local|grep QmUYndb1SkY49khYAg9Zn2yp9Z44cRFtqMnVAZP5qes8ce
(this indicates that the file is not here)

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Some IRC logs that could help solving the problem:

[20:11:25] whyrusleeping: I would like to debug the issue 1554 and while doing that getting a first feeling about the code
[20:12:16] whyrusleeping: Thus the command is ipfs refs local
[20:12:18] konubinix: ah, okay. So can you reproduce the error in the issue?
[20:12:24] Yes
[20:12:34] okay, so the code youre going to want to look at:
[20:13:18] https://github.com/ipfs/go-ipfs/blob/master/blocks/blockstore/blockstore.go#L110
[20:13:21] https://github.com/jbenet/go-datastore/blob/master/flatfs/flatfs.go#L266
[20:16:25] whyrusleeping: ipns is still failing in similar ways for me
[20:16:33] konubinix: no problem!
[20:16:41] might also check if this error is getting hit: https://github.com/ipfs/go-ipfs/blob/master/blocks/blockstore/blockstore.go#L131
[20:16:58] its logged as debug, so nobody would see it unless they turn all the logs on

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