ENH: Add ants JointFusion() node with testing
ENH: Add ants JointFusion() node with testing

Adding an interface for the ANTs based JointFusion
program.

Added _format_xarray() method to ANTSCommand base class

mick-d/nipype,FCP-INDI/nipype,FCP-INDI/nipype,sgiavasis/nipype,wanderine/nipype,FCP-INDI/nipype,carolFrohlich/nipype,iglpdc/nipype,iglpdc/nipype,mick-d/nipype,FCP-INDI/nipype,pearsonlab/nipype,iglpdc/nipype,dgellis90/nipype,mick-d/nipype,mick-d/nipype,dgellis90/nipype,wanderine/nipype,pearsonlab/nipype,dgellis90/nipype,dgellis90/nipype,sgiavasis/nipype,sgiavasis/nipype,sgiavasis/nipype,carolFrohlich/nipype,pearsonlab/nipype,carolFrohlich/nipype,carolFrohlich/nipype,pearsonlab/nipype,wanderine/nipype,wanderine/nipype,iglpdc/nipype