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This paper has been withdrawn by the author due to some problems. Please contact me.

This paper has been withdrawn. A significantly revised version will be posted in the near future.

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This article has been withdrawn due to an error in a proof of the main result.

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This paper has been withdrawn, because the result turned out to be well known.

This paper has been withdrawn by the author, since the author does not have enough time to answer every questions on this result.

Withdrawn; paper superceded by astro-ph/0105392

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This paper has been withdrawn by the author due to serious error found in main argument.

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This paper has been withdrawn by the authors due to new available results. A revised version, that incorporates the new results, will be submitted later.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author. Proofs of two propositions need more details.

This paper has been withdrawn by the authors due to need of essential revision.

This paper has been withdrawn at the author's request.

This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).

This paper has been withdrawn.