Make surjection pruning less orientation-dependent and fix short tail check #4422
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Changelog Entry
To be copied to the draft changelog by merger:
vg surject --prune-low-cplxshould no longer assess different contexts for different orientations of the same read, and should properly detect short tail anchors.Description
This expands the window size for context complexity assessment to be an odd size when the central anchor is an odd length, so it can be symmetrical and not depend on read orientation.
Also it fixes a broken-looking condition in short tail anchor detection.