New role for references to Python exceptions.  Created under misapprehension (wanted this for the API documentation, not Sphinx)
New role for references to Python exceptions.  Created under misapprehension (wanted this for the API documentation, not Sphinx)

jonfoster/pyxb1,balanced/PyXB,jonfoster/pyxb-upstream-mirror,jonfoster/pyxb-upstream-mirror,jonfoster/pyxb-upstream-mirror,CantemoInternal/pyxb,pabigot/pyxb,jonfoster/pyxb2,jonfoster/pyxb2,balanced/PyXB,pabigot/pyxb,CantemoInternal/pyxb,CantemoInternal/pyxb,jonfoster/pyxb1,jonfoster/pyxb2,balanced/PyXB