Rework lazy string optimization done in TXR 118.

This is also a bugfix.  Padding up the index to be at least
1024 characters longer than the existing prefix was dumb
and wrong; it changes the semantics of code which restores the
list from the lazy string, like the @(freeform) directive.
How much of the string is forced is visible to the caller!

* lib.c (lazy_str_force, lazy_str_force_upto): Don't
collect pieces from the lazy list and then catenate them
in one pass. Instead, use the existing function string_extend,
which grows the string exponentially.

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