Store history of actions involving a risk analysis

[cedricbonhomme]

Add the possibility to check the security log of important events involving a risk analysis.
Such as:

• risk analysis access log,
• modification of risks,
• any other important records to be logged as well (to determine).

Also take into account: #363.

[jerolomb]

it ll be also good to add the log of who export the risk analysis and when. And think about who ll access this information.