Support max length and depth for object printing.

* hash.c (hash_print_op): Implement max length.

* lib.c (lazy_str_put, out_lazy_str): Take struct strm_base *
parameter and implement max length.
(out_quasi_str_sym): Don't use obj_print_impl for symbol's
name string; just put_string. The use of obj_print_impl causes
symbols appearing as variables in quasiliterals to be
truncated when max length is imposed.
(out_quasi_str): Implement max length.
(obj_print_impl): Implement max length and depth. Note that
there is now always a non-null ctx pointer.
(obj_print): Always set up context pointer for obj_print_impl.
Context now has pointer to low-level stream structure, where
we can access max_length and max_depth. It also carries the
recursion depth.

* lib.h (lazy_str_put): Declaration updated.

* stream.c (strm_base_init): Add initializers for max_length
and max_depth.
(put_string): Pass stream structure to lazy_str_put.
(set_max_length, set_max_depth): New functions.
(stream_init): set-max-length and set-max-depth intrinsics
registered.

* stream.h (struct strm_ctx): New members depth and strm.
(struct strm_base): New members max_length and max_depth.
(set_max_length, set_max_depth): Declared.

* txr.1: Documented.

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