Optimise storage/calculation of geometry bounding boxes #2824
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This commit delivers a few optimisations to geometry classes:
Additionally, this commit moves the bounding box invalidation to a virtual QgsAbstractGeometryV2::clearCache() method, so that other non-bounding box caches can also be cleared when the geometry is modified. @jef-n #2817 will benefit from this (and also the smaller QgsPointV2 objects)