Pole Target for IK
==================
This adds an extra target to the IK solver constraint to define the roll of the IK chain.
blender.org - Inverse Kinematics
Also fixes a crashes using ctrl+I to set an IK constraint on a bone
due to the recent constraints refactor.
¡Que buena noticia estaaaa!!!, je, je, je. ¡Gracias pedropp!.
Un saludo.