Provide message for assert
Provide message for assert

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