Inherit job and project names from the script name

[liamhuber]

Have project inherit its default name value from the script name (or session and/or script), and jobs inherit (at least the stem) of their name from the script name. This makes it possible to make a workflow, save it, load it later, rename it, change some input parameters, and re-run it without hitting job-exists issues.

This should only be as a default, because you might want, e.g. two differently named projects in the same script.