move marpa_g_symbol_is_*_event_*() to group testing: t+
move marpa_g_symbol_is_*_event_*() to group testing: t+

pczarn/kollos,jeffreykegler/kollos,pczarn/kollos,jeffreykegler/kollos,jeffreykegler/libmarpa,jeffreykegler/libmarpa,pczarn/kollos,jeffreykegler/kollos,jeffreykegler/libmarpa,jeffreykegler/libmarpa,pczarn/kollos,pczarn/kollos,jeffreykegler/kollos,jeffreykegler/kollos,jeffreykegler/libmarpa