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it.  Not only that, I got this FutureWarning:

/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/simtk/unit/quantity.py:170:
FutureWarning: comparison to `None` will result in an elementwise object comparison in the future.
  if value == None:

sqrt of the variance), and average, returning a Quantity with the proper units.

This should be reasonably efficient, as it takes advantage of numpy-accelerated
methods if they're present.

Change doctests to reflect better preservation of tuples in collections of collections.
Note that outer container is still converted to list...