* eval.c (eval_init): lazy-str's third argument is optional.

Added lazy-stringp. Changing names of length-str-{gt,ge,lt,le}
to be consistent with the >, >=, < and <= functions.

* lib.c (lazy_stream_func): Greatly simplified implementation.
The lazy list now continues by means of recursing via
an optimized version of lazy_stream_cons called lazy_stream_cont.
The environment structure is simplified to just hold the next item,
rather than a pointless list. The pointless setting of lcons->lc.func
to nil is also removed; this is always done by the caller.
(lazy_stream_cont): New static function, similar to lazy_stream_cons,
but optimized by not consing up a new function and new environment
cell.
(lazy_stream_cons): The environment for the update function
is simplified to just a single cons.

* txr.1: Documented lazy string functions and lazy-stream-cons.

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