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been broken for a while and I doubt anyone ever used it (this also simplifies
it's interface).  Note that this change, along with the previous change by
Steven breaks backwards compatibility with the previous serialization format
for running_stats object.

running_stats object in statistics.h by including two functions that
compute the unbiased empirical skewness and kurtosis of a set
of real numbers.  Added unit tests for these functions in statistics.cpp.

and related tools.

with larger vectors and high bit sizes than the current LSH tool.
These are the new hash_similar_angles_xxx objects.

avoid duplicate code and generally cleaned things up a little.

a little nicer.

coded.  I also increased the default threshold to a more reasonable value.  The previous
value hardly excluded any points and gave a slightly worse average precision on a standard
test dataset.

based on the input pixel type rather than always using long.

on C++11 compilers.