Bug 98

After working with the subiamge problem I learned the following things from the current borgflow setup:
- The autorunner is a very cool thing. That it start calculations when one of the inputs change is highly rewarding.
- The drawback is that it often starts calculations while we couldn't care less about the results
- borgflow as it is now does not handle well in a practical setting. There we want the ability to write a command such as for a in images; do subimg $a blah; done

So we want an interactive prompt where we can simply state a command from a specific input, redirect it to an output in such a way that that command is automatically registered.

Together with this we need a form of 'ls' where a directory no longer is only a list of files, but a full table of tuples in which files can occur.