Cannot launch two different computations one after the other

[GVigne]

How to reproduce:

• Launch a computation (any will do)
• When the previous computation is over, launch the other type of computation (MCMC if the first computation was the Direct Model, Direct Model if the first computation was MCMC): Molonaviz crashes

My guess is that this happens because of the interaction between pyheatmy and QT threads. It seems that pyheatmy thinks wrong computations have been done because some of its objects live on the main QT threads (the ones checking what has been computed and what hasn't), whereas the real computations are done in a secondary thread.