string ranges: individual positions are ascending/descending.

In this patch we get rid of the wrongheaded notion that a
string range, as such, is ascending or descending. In fact,
the corresponding character positions are individually
ascending or descending.

* lib.c (seq_iter_get_range_str): Either increment or
decrement the character in the step string depending on
whether that position is in order or reversed.
(seq_iter_get_rev_range_str): Static function removed.
(si_rev_range_str_ops): Static structure removed.
(seq_iter_init_with_info): For string ranges, use
si_range_str_ops regardless of the strings being
lexicographically reversed.

* test/012/iter.tl: New test case.

* txr.1: Redocumented string ranges.

0 files changed, 0 insertions, 0 deletions