[issue7462] Implement fastsearch algorithm for rfind/rindex

[Florent Xicluna]

Changes by Florent Xicluna <laxyf at yahoo.fr>:


Removed file: http://bugs.python.org/file15654/stringbench_fixes_and_additions_v2.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7462>
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