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[make-github-pseudonymous-again]

• Evaluate whether instanceof checks are faster than isLeaf() calls. Not necessary since we do not use Leaf anymore.
• Rewrite delete_caseX cascade to forward precomputed sibling.
• Find out whether dummy Leaf nodes _color field can be removed. Not necessary since we do not use Leaf anymore.
• Find out whether dummy Leaf nodes can be easily replaced by null (see I believe there is a way to get rid of explicit leaves without loosing the simplicity of the balancing operations. #104).
• Rewrite insert_caseX cascade to forward precomputed grandparent, potentiall rewritting uncle = (n) => _uncle(n, grandparent(n));
• Break tail recursion of delete_caseX and insert_caseX cascades somehow.