Fix the tangents output by "Segment Tangent" and "BLine Tangent". They were scaled...

Fix the tangents output by "Segment Tangent" and "BLine Tangent".  They were scaled by a factor of 0.5 before.  Incremented the canvas version to 0.4 so existing .sif files still render the same.

git-svn-id: http://svn.voria.com/code@1856 1f10aa63-cdf2-0310-b900-c93c546f37ac