Add a note on why -output-directory is the approach taken when unpacking


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4850 de43f980-851b-0410-b2f7-c40aca1f87e0
Enable file/Io tests to run for both Lua and Windows scripts

This fix probaly breaks the testsuite on Unix as it puts the aux file in
the wrong place. However, at this stage it's best to get the newer system 
working.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4851 de43f980-851b-0410-b2f7-c40aca1f87e0