just-mrrc: support file options for the launcher functionality

When just-mr acts as a launcher, for most subcommand options the
"just args" entry in the rc files provides a convenient way to set
them. However, some options take a file as argument; for those it can
be desirable to set them without assuming a fixed file-system layout
and instead refer to logical roots, in particular the work space.
for the ones that refer to files, it is often desirable to have a potential
reference to the work space. Add this functionality.

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