Review importing of projects having older versions

We can't import projects from old versions. Maybe it works with the Default Project, but with ModelingEpilepsy or BuildingYourOwnNetworkModel (both projects from ladeluke) there are a lot of issues. The main thing to note here is that the way migration is done when we start TVB has some considerable differences than how it is done when we explicitly import a project from an older version.

I have already spent some time fixing this problem but:
a) It is not completely working yet.
b) It might not even be worth doing it because there are many things that need to be tested + we can always import them in the old version and then do the standard migration at launching.

I have some ideas though that could make the migration in these two situations more similar. If I can find a relatively easy way to do this, then I think we should suport importing of older projects, otherwise not. If we don't support it, then there is some code that can be deleted.