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This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

This paper has been withdrawn by the author, since some results of the paper have been already obtained in [J.~Lewandowski, Class. Quantum Grav. 9 (1992), no. 10, L147--L151.]

This paper has been withdrawn.

This paper has been withdrawn, as all conjectures (and one claim) have been proven incorrect. Some of what remains may eventually reappear in a different context.

This paper has been withdrawn by the author because it needs to be rewritten completely.

This paper is withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the author due to an error in the computation of the central charge.

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn

This paper has been withdrawn by the author, since the author does not have enough time to answer every questions on this result.

The paper was removed.

This paper has been withdrawn due to non-clearness of some technical points, as well as lack of a reasonable statement of quantization conjecture.

This paper is withdrawn by the author.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

This paper has been withdrawn.

This paper has been withdrawn since a trivial proof of the result has been pointed out to the author.

This paper has been withdrawn.

The paper has bene withdrawn by the author.

This paper has been withdrawn by the author due to inconsistency of the considered working hypothesis. The consistent treatment is presented in the last publications of the author.