Allow boolean values to be converted to Random. The link's value (0 or 1) has a...

Allow boolean values to be converted to Random.  The link's value (0 or 1) has a random value between -radius and radius added to it.  If the result <0.5, it's false, else it's true.  So with 'link=true' and 'radius=1', the result will be between 0 and 2, which is true about 75% of the time.  So get a 50:50 split, use a radius of a million.

git-svn-id: http://svn.voria.com/code@1690 1f10aa63-cdf2-0310-b900-c93c546f37ac