Various fixes on first LFS build.
Merge branch 'feature/various' into develop
Add ability to name multiple actions.
Add prepare action
Add an all option
More fixes including:

  Added an opm.virtual method that is only called at the start of an
  *all* action. this is to be used to create and install virtual
  packages composed of nothing more than calls to add other packages.

  Added a new $BUILDDIR to the sandbox. Packages are now actually
  configured and build from outside of the $SOURCEDIR by default.