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This paper has been withdrawn by the author due to an error in section 7. There is a new version: arXiv:1011.3352.

This paper was withdrawn by the authors.

This paper has been withdrawn by the authors due to need of essential revision.

This paper has been withdrawn by the author, due to an error in Proposition 2.2.

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author due to the presented idea is wrong.

This paper has been withdrawn as it has been superseded by postings arXiv:quant-ph/0702147 and arXiv:0712.2935

This paper has been withdrawn.

This paper has been withdrawn by the author due to a crucial error related with the consideration of regular points

This paper has been withdrawn because the models on which it was based have undergone significant changes and improvements. A new paper with the same title, based on the improved models, is accepted for publication in MNRAS and is available…

This paper has been withdrawn by the authors due to a possible inconsistency in the program code.

This paper has been withdrawn by the authors due to a crucial error.

This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

This paper has been withdrawn

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the authors

This paper is withdrawn by the author. See math.GT/9811093 for replacement.

This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.