string_table::to_name more useful for unknowns
string_table::to_name more useful for unknowns

it now returns a string like $prefix0xNNN showing the
hex value of the unknown enum value.  This is far more
useful than "unknown".

gnb/novaprova,gnb/novaprova,loom-project/novaprova,novaprova/novaprova,novaprova/novaprova,loom-project/novaprova,gnb/novaprova,gnb/novaprova,greig-hamilton/novaprova,novaprova/novaprova,greig-hamilton/novaprova,loom-project/novaprova,novaprova/novaprova,greig-hamilton/novaprova,gnb/novaprova,greig-hamilton/novaprova,loom-project/novaprova,greig-hamilton/novaprova,novaprova/novaprova