streams: revise stream-max-len over strings.

The maximum number of characters printed from a string
is too small, if it is directly taken from the stream-max-len
value. We are going to multiply it by 8, and clamp the
minimum characters at 24.

* lib.c (max_str_chars): New inline function.
(lazy_str_put, out_lazy_str, out_quasi_str): Use inline
function to determine maximum number of chracters to print.
Also bugfix here: decrement and test max_chr in the loop, not
max_len. This bug was copy-pasted across all these functions.
(obj_print_impl): Similarly revise the printing of strings.

* txr.1: Documentation updated.

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