[SCM] libspatialindex annotated tag, upstream/1.8.1, created. upstream/1.8.1

[Bas Couwenberg]

The annotated tag, upstream/1.8.1 has been created
        at  1e87ce927411586178ef8b079cdea015af43fed1 (tag)
   tagging  b2c27c2d29691589ab05b7738b00792546f73f1b (commit)
  replaces  upstream/1.7.0
 tagged by  Bas Couwenberg
        on  Fri Jan 10 16:38:27 2014 +0100

- Shortlog ------------------------------------------------------------
Upstream version 1.8.1

Bas Couwenberg (1):
      Imported Upstream version 1.8.1

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A general framework for developing spatial indices