This function create a pseudotime tree structure and position each cell on one of its branches.
| ordering | character string. The name of the phenotypic metadata use to define the pseudotime ordering. Default to 'timepoint'. |
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| process_plots | logical value. Whether to show processing plots. Default to TRUE. |
| basename | a character string indicating the path and prefix of the processing plots. Default to 'Pt_tree'. |