Reissue of MNG-251: maven-archiver should be able to include the snapshot version/build number

From MNG-251:

bit of a chicken and egg problem under the current arch. I want to include:

• the build number as a separate manifest entry
• the correct version in the manifest and META-INF/maven/pom.xml

However, the snapshot is only determined when the artifact is transformed for install - which comes after package.

I think this may need to be a phase before package, or part of an existing phase, or that packaging actually does the version assignment, and install/deploy just utilises it.

More thinking required.