Correct value_datatype for whitespace facet.  More cleanup of enumeration tag/value/unicodeValue.
Correct value_datatype for whitespace facet.  More cleanup of enumeration tag/value/unicodeValue.

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