Handle index clobbering
=======================

See http://trac.gispython.org/lab/ticket/160

Clean up leftover data

  >>> import os
  >>> try:
  ...     os.remove('/tmp/rtree_test.dat')
  ...     os.remove('/tmp/rtree_test.idx')
  ... except OSError:
  ...     pass

  >>> from rtree import Rtree
  >>> k = Rtree('/tmp/rtree_test')
  >>> k = Rtree('/tmp/rtree_test')
  Traceback (most recent call last):
  ...
  TypeError: IllegalStateException: SpatialIndex::DiskStorageManager: Failed reading pageSize.
  Please contact mhadji@gmail.com
