[update 1.3] #13116

13116
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- Issue 3892: clean AbstractHierarchicalList.
- Issue 3899: clean up #maybeDuplicateMorph:.
- Issue 3888: Move Digital Signatur code to System-Hashing package.
- Issue 3898: Remove some dead code from PasteUpMorph.
- Issue 3779: isUnicodeStringWithCJK returns false on a string containing Kanji


Stef