Fix WPXPropertyList::operator= to copy and not merge two WPXPropertyLists
Fix WPXPropertyList::operator= to copy and not merge two WPXPropertyLists

Distrotech/librevenge,cpjreynolds/libwpd,Distrotech/librevenge,Distrotech/libpwd,cpjreynolds/libwpd,Distrotech/librevenge,Distrotech/librevenge,Distrotech/libpwd,cpjreynolds/libwpd,Distrotech/librevenge,Distrotech/libpwd,Distrotech/libpwd