Verify if we had breaking changes in the project file format

[aalex]

We now have a regex to parse the version number of MapMap in the project file. See #435.

We should blacklist some old versions that are no longer supported, if any.

That means that we must figure out if there was a breaking point, and if so, change that accordingly. Did we change the file format of MapMap?

[sofian]

I cannot recall if we changed the format or not...