Split <project> element, for readability
Remove Graph_Cut remnants

It was meant to be fully removed with:

https://github.com/fiji/pom-fiji/commit/e00ab898c391b21b0d4fc2224a7eada23348d789

But some traces remained.

Hopefully Graph_Cut will come back once it has a reproducible build:

https://github.com/fiji/Graph_Cut/issues/2