gEDA-dev: libgeda error reporting

[Ales Hvezda]

> Actually, I would rather avoid writing anything to
> log files (or stdout/stderr) from libgeda, as this
> seems better handled by programs using libgeda
> functions.

I'm okay with removing the stdout/stderr message from
libgeda, however, don't just arbitrarily remove alll the logging
calls (the ones using the builtin logging mechanism inside
libgeda).  They were added for a specific reason.

-Ales