factorize things
The old vessels and the new
Remove some vessels.
and comment.
lint
After pleroy's review.
after pleroy's second review.
Another 0U
line length
Merge pull request #203 from eggrobin/mocking-the-plugin

Adding and removing vessels
Forwarding constructor.
Lint.
Lint.
Lint.
Lint.
Merge pull request #204 from pleroy/VesselCelestial

Forwarding constructor for Celestial