[SCM] libspatialindex branch, master, updated. upstream/1.7.0-29-g8f2f076

[Bas Couwenberg]

The following commit has been merged in the master branch:
commit 1bcf342077fffd0d095c8d4d894a3ff641e51355
Merge: 19658bc99c075ffdeba61ee82a964ee2eeac1bde b2c27c2d29691589ab05b7738b00792546f73f1b
Author: Bas Couwenberg <sebastic at xs4all.nl>
Date:   Fri Jan 10 16:38:27 2014 +0100

    Merge tag 'upstream/1.8.1'
    
    Upstream version 1.8.1


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A general framework for developing spatial indices