Draft: added conversion from Quaternion to primitive NDArray (this looses information)

There is no conversion for Quaternion-Types yet.

I only added the conversion for Quaternion to primitive NDArray, but this version loses information.

assigned to @plewnia

added 5 commits

• 70d1b020 - added function to check level of memoryID
• ac8a9645 - fixed circular import
• 7b8bf429 - deleting corrupted metadata and data files when trying to load
• ea5e76a4 - adjusted handleing of corrupted files
• b15f8c0a - Merge branch 'feature/ltm' into fix/missing_quaternion_conversion

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