And use the function in script-fu. While we want wrong resource names to
trigger WARNINGs in Script-Fu scripts and plug-ins (because these can be
considered as a bug), we don't want it to happen when the resource is
not loaded on purpose (mostly it means that we run GIMP with --no-data
or --no-fonts). This was happening in our own builds when running GIMP
through the in-build-gimp.py script and that was always very annoying.
Now in such a case, we will only output an INFO message on stderr (it's
still a good idea to warn about this, because if we imagined someone was
running a script non-interactively, which called one of these
procedures, they may have relied on the default value of some arguments.
Therefore they'd want to know about such a behavior change).
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