Fix up list

List did not generate filenames for the config, test if the config existed and
append data correctly. This commit fixes all that so we should be able to list
now.
Use mdix for indexing

mdix is my solution for indexing text. It is a very simple lua wrapper around
xapian. We should use it across all my projects. This makes mgr do so.
Check if config has a keep to delete

Some projects take so long to clone that I don't want to delete them when
stopping. I should probably just move them out of the way, but for now I will
keep them in the same place but not delete when stopping.
Update readme