Replace node report Markdown with Panel

[jeromekelleher]

Clunky report tool can be replace with panel very easily. Here's something that's most of the way there.

node = ti.pango_lineage_samples["B.1.1.7"][-1]
#node = 131223
closest_recombinant, df = ti._show_path_to_root(ti.ts.first(), node)
df_mut_path = ti.mutation_path(node)

child  = node
edge_list = [
            ts.edge(eid) for eid in np.where(ts.edges_child == child)[0]
        ]
edges = tskit.EdgeTable()
for e in sorted(edge_list, key=lambda e: e.left):
    edges.append(e)

html = ti._copying_table(node, edges)

pn.Accordion(
    ("Metadata",pn.pane.JSON(ti.nodes_metadata[node])),
    ("Copying path", pn.pane.HTML(html)),
    ("Path to root", pn.widgets.Tabulator(df)),
    ("Mutation path", pn.widgets.Tabulator(df_mut_path)),
    active=[0, 1],
)