Improve calculation of phase probabilities when normalizing so they really should add up to 1.
Allow slight tolerance in checking for sum of phase probabilities.
Add missing call to normalize in iterator constructor.
Remove asserts that duplicated the error handling code - better to provide consistent behavior via the error handlers.
Add comment to examples about other containers working equally well.
[distributions] Hyper-Exponential: added test for special cases (i.e., the one discussed under the 'Related distributions' section of the doc).