rename shift_sym -> width_sym_tags.
set now uses obj_id_hash.
empty map.h.
comment.
for_ins macro.
set improvements.
remove semicolon.
use is.
rename Src_pos pos -> off.
rename Parser sp -> pos.
field order.
Parser src -> s.
parse_src now receives Obj path, src.
improve xcode build scripts.
src_dict.