BoneJ2 first user release

The first user release of BoneJ2 is now available from the BoneJ update site in the ImageJ updater.

All users are recommended to install BoneJ2 for new projects.

Users who need to keep a legacy BoneJ 1.x around for reproducibility or long duration project reasons should install BoneJ2 into a new Fiji installation, kept in another directory from the old installation.