Revision 982126

BUILDR-488 artifact poms not reinstalled

Also:  it's now possible to provide artifact content with,
        artifact(...).content some_string

Also:  artifact(...).pom.from(file) works as expected.

Also:  poms associated with packages are no longer created directly
       in the local repository.  they are created alongside packages
       under 'target' which is more consistent.  the local repository
       is therefore only written when installing/downloading artifacts
       -- not during packaging.