Added an __add__ function to Location, to permit a more convenient syntax for union(), i.e. loc1 + loc2 and loc1 += loc2.
Added an __add__ function to Location, to permit a more
convenient syntax for union(), i.e. loc1 + loc2 and loc1 += loc2.


svn/trunk@158

nltk/nltk,nltk/nltk,nltk/nltk