AmbiguousAlignmentChainsFilter.maxRelativeDiff

Two scores are considered similar if the relative "error" of them is smaller than defaulMaxRelativeDiff.

The relative error is defined as:

relError(a, b) = abs(a - b)/max(a - b)

**Implementation note:** all computations are done in integer arithmetic hence AlignmentChain.maxScore corresponds to 1 in the above equation.

class AmbiguousAlignmentChainsFilter
enum maxRelativeDiff = AlignmentChain.maxScore / 20;

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