[PostGIS] #5861: pgtopo_import: add switch to request pre-dropping an existing topology

[PostGIS]

#5861: pgtopo_import: add switch to request pre-dropping an existing topology
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  Reporter:  strk         |      Owner:  strk
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  PostGIS 3.6.0
 Component:  topology     |    Version:  master
Resolution:               |   Keywords:
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Changes (by strk):

 * milestone:  PostGIS Fund Me => PostGIS 3.6.0
 * type:  defect => enhancement

Comment:

 See also #5860 which could make it easier to tell when --drop-topology
 would be useful
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5861#comment:2>
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