- Re-added SparseList.__hash__, with a body that throws a TypeError,   so the SparseList will exactly mimic a list.  (The exception message   needs to be identical to pass unit tests.)
- Re-added SparseList.__hash__, with a body that throws a TypeError,
  so the SparseList will exactly mimic a list.  (The exception message
  needs to be identical to pass unit tests.)


svn/trunk@1812

nltk/nltk,nltk/nltk,nltk/nltk