KmerSegmenter: CountKmerAffectAnalyser::searchMax now returns -1 on failture.
We update accordingly the tests to see if we're lacking V or J. In some very specific cases we may have some V and some J, but still not be able to find a maximum. We put the cause of unsegmentation to UNSEG_TOO_FEW_ZERO which may be misleading but somehow represents the reality (we have zero valuable information)
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