Reorganising Maven build (again!) --

I am reorganising the Maven build to better suit levigo's normal practises.
The package builder is now a parent project (which removes a need for the
common project), and the script project is the only submodule of the parent
project.
Finished build reorganisation --

I have a Maven build I like!  The showcase script is even copied over with the
correct permissions!!
Modified package layout --
Added very rough stage2 handover code --