defines for the blocks of a blockvector that contain global and
file-static symbols and the first of the smaller scope contours.
* symtab.c (lookup_symbol, find_pc_symtab, find_pc_line,
decode_line_1, make_symbol_completion_list): Use the above.
* symtab.c (list_symbols): Process the first symbol of the
static psymbols list.
(types_info): Restore this function from its untimely #if 0.
It's not perfect, but it is better than nothing.
(_initialize_symtab): Restore "info types".
