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

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

Clean up leftover data

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

  >>> from rtree import Rtree
  >>> k = Rtree('rtree_test')
  >>> k = Rtree('rtree_test')
  Traceback (most recent call last):
  ...
  RTreeError: Error in "Index_Create": Spatial Index Error: IllegalStateException: SpatialIndex::DiskStorageManager: Failed reading pageSize.
  
  >>> del k
  >>> try:
  ...     os.remove('rtree_test.dat')
  ...     os.remove('rtree_test.idx')
  ... except OSError:
  ...     pass