Explicit handling of treetime outputs

[uee9]

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Hello!

Thank you for making a really great tool available. I was hoping that you all might be able to implement some explicit handing of treetime outputs. Treetime has found widespread use in the pathogen genomics since the onset of COVID-19 pandemic however explicit support its outputs is notably absent from ggtree. Specifically parsing of the annotated nexus files with mutations and visualization of timing uncertainty (which is available in tabular format not in the nexus file) would complement those available for other widely used such as BEAST and HyPhy.

Thanks!