DestinNetworkAlt: added displayLayerCentroidImages which
displays all centroids in a layer together in one image
displayLayerCentroidImages - border stays a constant size so it
does not depend on the scale_width. Added comments.
experiment 64. turned on boltzmann
able to set boltzmann temperatures
refactored Boltmann tranform into its own function
fixed bug where the fix learn rate was not given a default
- builds two version of the destin library, unit test vs non unit test
so that more checks can be done in the unit_test build
-Replaced doesBoltzman flag with a function pointer so that different
belief transforms can be dropped in easier.
-added serializeVersion to the destin struct to prevent loading
incompatible destin saved states.

Conflicts: ( from cherry pick )

	Destin/DavisDestin/src/util.c
DestinNetworkAlt: fixed setTemperatures bug.
letters_experiment.py: put a flag of whether to save the results
of the experiment
implemented Power Norm (PNorm) belief transform to be an alternative
to the boltzmann belief transform.
dostuff.py: trying out the new power normalization as an alternative to
the boltman distribution
dostuff.py: set it to go(500) to make it show 500 frames to be
consistent with the README again.