* app.c (process_escape): new function to handle escapes the right
way, (do_scrub_next_char): use new function
* cond.c (s_ifdef): do ifdef/ifndef right
* read.c (s_fill): make the , expressions optional like the doc
says
* config/tc-h8300.[ch]: better warnings
command line option.
* listing.h, listing.c: now prints addresses with ??? instead of 0 when
errors in assemble prevent addresses being known. Prints
symbol table more tidily. Allows different parts of the
listing to be selected.