Nyall Dawson c2f8a8224b Geometry error string is not shared
Instead move it to a private QgsGeometry member. It's copied
with QgsGeometry, but not the underlying private geometry
data.

This means the error string can be changed without detaching
(and copying) the geometry data.

Also make greater use of error string for all use of GEOS
functions.
2017-08-31 08:36:01 +10:00
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