I finally had a little success !
The fix suggested by @abit worked alright - It was my fault.
Steemd replayed, started a witness, synced and started mining.

<center>http://i.imgur.com/1fMUR3c.png</center>

<center>(Yeah)</center>

<center>http://i.imgur.com/3fYOdlm.png</center>

## The whole thing is pointless, though.

http://i.imgur.com/ASXBMzq.png

### There is a bug.

http://i.imgur.com/ErSM938.png

So I won't be able to show off a POW.
### Nobody is back in the miner queue with his Supercomputing accounts.

<center>http://i.imgur.com/1aOPVrm.png</center>
<center>(picture taken from steemdb.com)</center>

It looks like two people can exploit this bug.

I hope it gets fixed quickly and that I can get the miner running quickly after the next fork.

Thanks @abit and @smooth for taking the time to help me.
___
# Can you spot the difference ?

    sudo mount -o remount,size=10G /dev/shm
works.

    sudo mount -o remount, size=10G /dev/shm
doesn't work.

_Maybe I can skip avoidable mistakes like that next time._
___

Here is a picture of my miner hashing:
<center>http://i.imgur.com/99y1Kxm.png</center>
<center>(For proof)</center>

I'm waiting for the bugfix now.

Steem on !