Redirect parseInputs to getInputs

The parseInputs method is, barring the `processFn` method completely replaceable by `client.getInputs(True)`. Made this modification and added a test.

See: https://trac.openmicroscopy.org.uk/ome/ticket/12255

A next step possibly for this PR is to make use of this method in all scripts.

/cc @will-moore @carandraug