[MERGE] pyrex bencode implementation

[Alexander Belchenko]

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Here is the patch for pyrex bencode version.

I create simple benchmark for tags serialization/deserialization
(i.e. indirect benchmark for bencode). This benchmark use
tags dictionary with 100 items.

Here results on my machine (CeleronM 1.7GHz Windows XP)

Pure python bencode:

     906ms bzrlib.benchmarks.bench_tags.TagsBencodeBenchmark.test_deserialize_tags
     656ms bzrlib.benchmarks.bench_tags.TagsBencodeBenchmark.test_serialize_tags

Pyrex version:

     375ms bzrlib.benchmarks.bench_tags.TagsBencodeBenchmark.test_deserialize_tags
     453ms bzrlib.benchmarks.bench_tags.TagsBencodeBenchmark.test_serialize_tags

These numbers are for 1000-iteration loop, so you need to divide time by 1000,
i.e. it's actually us not ms for 1 iteration.

As in my previous testing for generic data set, implementing bdecode in pyrex
give bigger win in performance. And IMO it's good, because read operations
executed more frequently.

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[µ]
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