[postgis-devel] Another fix in 1.0.6 (bbox of SnapToGrid output)

[strk at refractions.net]

Another minor fix in 1.0.6:

SnapToGrid output bounding box was computed "snapping" the
original one. The snapping happened using float numbers rather
then doubles, and this could have produced slightly smaller
bboxes then geometries. I've changed it to:
	- convert box2d cache to box3d 
	- snap box3d
	- convert box3d to box2d (will enlarge if needed)

--strk;

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