app: add SIGABRT to be handled by gimp_fatal_error().
SIGABRT is definitely a fatal error, at least in GIMP context. It is used by g_assert() and more generally by abort(). Actually I am a bit unsure about the difference of gimp_terminate() and gimp_fatal_error(). The former mostly depends on whether we used --debug-handlers or not, which reads "Enable non-fatal debugging signal handlers". But the way we handle them, the list of signals handled by gimp_terminate() seem to always end up fatal as well, anyway. So either we should *really* make them non-fatal (I could imagine that SIGTERM or SIGINT indeed could be better handled for instance), or we should just get rid of this terminate/fatal_error differentiation which seems totally artificial and non-existing in the current code.
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