New ETE release: ete-2.2

A new ETE version (2.2) is now available. It includes several new features and bug fixes. Most notably,

- A new EvolTree class type, developed by Francois Serra (at CNAG), which can be used to run adaptation tests and visualize results directly on tree branches and alignments.

- Several new face types are available to plot sequence domains, PieCharts and Barplots (see extended changelog for some examples)

- The TreeKO method (Marcet-Houben and Gabaldón, 2011), used to render all species trees derived from a duplicated gene family tree, has been ported and optimized as a built-in function of the PhyloTree class.

- The core Tree object includes some new features, such as a robinson-foulds metric function, new traversing methods including the iteration of node ancestors, custom collapsing options, an improved tree pruning method, and several function to resolve polytomies and check the monophyly of custom attributes within a given node.