deploy-file replaces main artifact of a project

When using the deploy-file goal in a project (not from the command-line), the specified file will replace the artifact of the current project, which may later lead to project artifact corruption, especially in a multi-module build. Instead the deploy-file goal should not touch the project artifact, or it should be conditionally set.

The offending line should be removed from DeployFileMojo

//project.setArtifact( artifact );