Change N4 dimension input to use short tag
Change N4 dimension input to use short tag

Using short tag will allow use of newest ANTs releases as well as provide backward compatibility as only the long tag changed. Also removed conflicting `requires` tags.
iglpdc/nipype,wanderine/nipype,gerddie/nipype,carolFrohlich/nipype,wanderine/nipype,mick-d/nipype,blakedewey/nipype,blakedewey/nipype,dgellis90/nipype,iglpdc/nipype,pearsonlab/nipype,carolFrohlich/nipype,gerddie/nipype,mick-d/nipype,carolFrohlich/nipype,glatard/nipype,FCP-INDI/nipype,glatard/nipype,blakedewey/nipype,FCP-INDI/nipype,sgiavasis/nipype,sgiavasis/nipype,gerddie/nipype,blakedewey/nipype,dgellis90/nipype,wanderine/nipype,pearsonlab/nipype,iglpdc/nipype,glatard/nipype,mick-d/nipype,dgellis90/nipype,pearsonlab/nipype,carolFrohlich/nipype,FCP-INDI/nipype,mick-d/nipype,iglpdc/nipype,sgiavasis/nipype,sgiavasis/nipype,dgellis90/nipype,pearsonlab/nipype,FCP-INDI/nipype,gerddie/nipype,wanderine/nipype,glatard/nipype