[PostGIS] #6095: add fixVertexSegmentPairsBelowDistance

[PostGIS]

#6095: add fixVertexSegmentPairsBelowDistance
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  Reporter:  Lars Aksel Opsahl  |      Owner:  strk
      Type:  enhancement        |     Status:  new
  Priority:  medium             |  Milestone:  PostGIS Fund Me
 Component:  topology           |    Version:
Resolution:                     |   Keywords:
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Comment (by Lars Aksel Opsahl):

 The reason we ran into this problem was that we were asked whether we
 could deliver valid data at a lower precision, for example when exporting
 to GeoJSON. It was during this investigation that we identified this type
 of problem.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6095#comment:3>
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