Curve rendering

* AppNote #19 - 'Curves'

* sample  scene file - curveRen.ma , sample output image
* mtorCurveWidth

* fur overview [from RAT docs]
* mtorFur - [also from RAT docs]
* mtorFur.so is what makes basic fur possible -  look for it under RAT ....lib/plugins
[need to 'import' it into a Slim palette]
* sample scene - furRen.ma and output