Display clade sizes

[annazhukova]

When a collapsed node does not represent a monophyletic clade, show the information on the number and the sizes of the monophyletic clades of the corresponding state included in it.

For example, for a tree (((a1, a2)A1, b)A2, ((a3, a4)A3, a5)A4)A5; assuming tips a1-a5, and internal nodes A1-A5 are in state A, and tip b is in state B, after collapsing we will have a node A of size 5, for which we'd want to know that it includes 2 monophyletic clades of sizes 2 and 3.