LargeCount VerticesExtractor::getDefaultNumberOfBitsForBloomFilter() should not overflow

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Link: http://permalink.gmane.org/gmane.science.biology.ray-genome-assembler/619

The code:

LargeCount VerticesExtractor::getDefaultNumberOfBitsForBloomFilter(){

/*
 * This is the product of these values:
 *
 * * Number of sequences on the rank;
 * * K-mer length;
 * * Number of strands (2);
 * * Number of directions in one dimension (2);
 */

        int numberOfErrorsPerRead = 4;

        int erroneousKmersPerError = m_parameters->getWordSize() * 2 * 2;

        // the formula below is completely arbitrary.
        // for serious cases, you should do an initial run
        // and then you should modify -bloom-filter-bits

        // furthermore, this formula does not consider
        // the true kmers in the genome

        int numberOfLocalReads = m_myReads->size();

        int bits = numberOfErrorsPerRead * erroneousKmersPerError * numberOfLocalReads;

        return bits;
}

Solution: add a maximum number of bits (let's say something like 1 GiB).

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