After calling repack, code checks the last modification time vs the current time.  Only proceeds to delete old file and move repacked file after 1s has passed.

Works in Spyder and allows catching of repack error

Changed subprocess.call for repack to no longer send sys.stderr as stderr.  This breaks in iPython because it overwrites the stderr with an ioStream that cannot be treated as a file.

Contains the ImageWindowing class

Added creation and desctruction of QtApp so that the FileDialog will work.

Extracted two methods from reshape_to_Ndims:
  get_sort_order returns the order of rows in a dataset or array from fastest changing to slowest
  get_dimensionality returns the number of unique elements in the rows of a dataset or array

see commits

This reverts commit f6b76db8.