Add errorlevel tests to Lua-based "make check"

The code now stops after the first failing module: assumption is that
we will alter tests so they have to all pass for a release!


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4768 de43f980-851b-0410-b2f7-c40aca1f87e0
Add errorlevel return to Lua-based "make doc"


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4769 de43f980-851b-0410-b2f7-c40aca1f87e0