PennockTech / tabular / 13343872160

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Implement sort-by-column feature

The `Table` interface gains `SortByNamedColumn()` and `SortByColumnNumber()`
which sort the table rows in-place.

    err = tb.SortByNamedColumn("Some Header", tabular.SORT_ASC)

Introduce the `SortInter` interface which a value stored in a Cell can
implement; a method `SortInt64() int64` will let objects define their sort
order. See the `sort_test.go` sorting by position-in-greek-alphabet for an
example.

Fixed nested `*Cell` inside `Cell` to propagate rendering values.

Fixed that table `columnNames` field was never populated.  We populate it
afresh on every `AddHeader` call.

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