错误修复：
The bounding box was being incorrectly calculated on some T-splines surfaces, resulting in clipping-plane-like behavior. This is now fixed.
Normals are now more correctly calculated when extruding edges, which makes using the UVN manipulator more useful.
A crash that occurred when tsStandardize was used when symmetry was on has been fixed.
tsSymmetryOff now ungroups objects if they are not connected.
Double-clicking to select an edge loop now works inside commands.
tsUnweld now ungroups objects if they are not connected after the command.
The T-splines installer now works better in Vista.
