tprint and -t option: handle infinite list.

Test case: txr -t '(gun "foo")' must run in
constant memory.

* eval.c (tprint): Rewritten to iterate over lists using
open loop rather than mapdo. Classification of the sequence
is done using the new seq_info, as must be for all new
sequence functions.

* txr.c (txr_main): Implementation of -t, -p and -P captures
the result of the expression in a variable whose value is
zapped when it is passed to the function. A gc_hint is added
so that this isn't optimized away. Thus, this code won't hold
on to the original pointer to a lazy, infinite list.

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