Fix inconsistent use of tabs and spaces in indentation.
Fix inconsistent use of tabs and spaces in indentation.

Causes TabError.

lanselin/pysal,ljwolf/pysal,sjsrey/pysal,ljwolf/pysal,ljwolf/pysal,weikang9009/pysal,lixun910/pysal,lixun910/pysal,pysal/pysal,lixun910/pysal,pedrovma/pysal