Barend Gehrels 6158064410 [buffer] performance optimization: set the center point for buffers around
(multi)points, calculate min/max radius
and (when checking turn w.r.t. piece) check turn distance to center,
in most cases leave early

Including unit test. For multipoint_b_500k this increases performance with
a factor 6 (340 seconds -> 55 seconds)

Note, this is done for buffers around points but could be done for other
geometry types too (using e.g. centroid)
2015-05-13 13:08:22 +02:00
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