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Problem: The new regexp engine does not give an error for using a back
reference where it is not allowed. (Dominique Pelle)
Solution: Check the back reference like the old engine. (closes #1774)
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Problem: Regexp fails to match when using "\>\)\?". (Ramel)
Solution: When a state is already in the list, but addstate_here() is used
and the existing state comes later, add the new state anyway.
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Problem: The example that explains nested backreferences does not work
properly with the new regexp engine. (Harm te Hennepe)
Solution: Also save the end position when adding a state. (closes #990)
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Problem: Test files have inconsistant modelines.
Solution: Don't set 'tabstop' to 2, use 'sts' and 'sw'.
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Problem: Recursive call to substitute gets stuck in sandbox. (Nikolai
Pavlov)
Solution: Handle the recursive call. (Christian Brabandt, closes #950)
Add a test.
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Problem: Equivalence classes are not properly tested.
Solution: Add tests for multi-byte and latin1. Fix an error. (Owen Leibman)
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