Bugfix: Harmonization Heap

David Schäferrequested to merge
harmfix into develop

Pushing two datasets with different indices to the harmonization heap broke the deharmonization for the second, as it got the index from the first.

Also fixed a failing test, that relied on this behavior.

Could you please have a look @luenensc , if I now broke something else?

Edited by David Schäfer

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