What do you think about making choice to load or not to load qucs schemaatic if it has version mismatch? This feature may be Qucs advantage against commercial circuit simulators, that not allowes to load another document versions.
I add this experimantal ability. Now if you try to load schematic and it has another version, you can load it anyway or stop loading. Qucs now can offer load or not to load such documents.
See, please, Pull Request #30 at github.com