importing model already in version 6

[carieh]

While EwE is still under development and has not 'hit the shelves' yet, we do not bother trying to keep the application compatible with earlier EwE6 database versions. Version backward compatibility will be introduced when EwE6 is released to the public.

I'm sorry, I realize that this is a pain for testing. Hopefully the database design will stabilize soon (although Time Series database support is looming...)