- added proper iterator for W - allow for ordering of ids in W
- added proper iterator for W
- allow for ordering of ids in W

pombreda/pysal,Alwnikrotikz/pysal,tectronics/pysal,google-code-export/pysal,AlanZatarain/pysal,Alwnikrotikz/pysal,google-code-export/pysal,pombreda/pysal,Alwnikrotikz/pysal,pombreda/pysal,google-code-export/pysal,pombreda/pysal,google-code-export/pysal,AlanZatarain/pysal,tectronics/pysal,tectronics/pysal,AlanZatarain/pysal