chore: Update release notes and NuGet package (#149) · sestoft/C5@2243863

#warning: 'INEFFICIENT'

#warning: 'must we check stamps here?'

#warning: 'INEFFICIENT'

#warning: 'must we check stamps here?'

#warning: 'for bag implementation: count is wrong'

#warning: 'how does this work together with persistence?'

#warning: 'improve (mainly for bag) by using a Node iterator instead of ItemMultiplicities()'

#warning: 'how does this work together with persistence?'

#warning: 'improve (mainly for bag) by using a Node iterator instead of ItemMultiplicities()'

#warning: 'Improve if items is a counting bag'

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