Correct the fixup of md5 files with paths
Make md5 checking on os x more robust
Create temp directorys under TEMPDIR on osx
Ensure asserts within plan functions are reported
Fix docstring for get-environment
Make local relative paths user home relative

When running local script functions, relative paths should be resolved relative
to the user's home directory, for consistency with ssh execution.
Don't swallow exceptions from ssh script execution
Add action option to enable script tracing
Add another test for file script function
Add precondition for debconf-set-selections