Issue #649, Issue #647 [pedigree] Enlarged infertility markers; enlarged monozygotic line; more vertical separation between all nodes
Issue #590: [pedigree] Selecting twin option in the sibling menu creates a twin for the current node; removed dedicated twin button
[pedigree] minor code cleanup/minor UI fixes (move text a few pixels lower if infertile marke ris present)
[pedigree] center relationships between partners, if possible