+ fix logic in rel_to_abs:   if last command is 'z' use previous vertex   (if exists) to obtain abs coordinates
+ fix logic in rel_to_abs:
  if last command is 'z' use previous vertex
  (if exists) to obtain abs coordinates

git-svn-id: 5adfda8227e14e59fd47d5bd9925a30df16fed74@1845 d397654b-2ff0-0310-9e29-ba003691a0f9

craigds/mapnik2,makinacorpus/mapnik2,craigds/mapnik2,craigds/mapnik2,makinacorpus/mapnik2,craigds/mapnik2,makinacorpus/mapnik2,makinacorpus/mapnik2