seq-begin: bugfix: non-lists don't work.

* lib.c (seq_begin): Do not null out si->inf.obj; it's needed
for accessing hashes and vector-like objects. This bug means
that seq-begin iteration has only worked correctly for lists.
The original motivation was not to have spurious retention of
the head of a lazy list, which is hereby reintroduced. But
iterators can be rewound. Let's just document this away and
leave it as a to-do item.

* txr.1: Document the limitation of seq-begin w.r.t.
lazy lists.

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