Revision 169873

o Added support to RewritePhase of repoclean to copy -SNAPSHOT.version.txt and -RELEASE.version.txt (or whatever it's called) using ArtifactMetadata, where these files exist in the source repo.
o Reformatted mojo annotation doco to tabular format.
o Committed a start to the plugin-overview (developer's PoV on this)...it's just an outline with an incomplete introduction for now, but it's still a start.