AmbiguousAlignmentChainsFilter.maxAbsoluteDiff

Two scores are considered similar if the absolute "error" of them is smaller than defaulMaxAbsoluteDiff.

The relative error is defined as:

absError(a, b) = abs(a - b)

**Implementation note:** all computations are done in integer arithmetic hence all scores are lower than or equal to AlignmentChain.maxScore .

class AmbiguousAlignmentChainsFilter
enum maxAbsoluteDiff = AlignmentChain.maxScore / 100;

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