Series decomposition

'chart-types-decomposition': () => ({
  rows: [], config: {},
  foot: ['the same series, read four ways', 'trend, season and the residual, stacked'],
  mount: mountGridCharts({
    rows: decompRows(),
    columns: [
      { field: 'month', title: 'Month', layout: { pin: 'start', width: 120 } },
      { field: 'observed', title: 'Observed', type: 'number' },
      { field: 'trend', title: 'Trend', type: 'number' },
      { field: 'seasonal', title: 'Seasonal', type: 'number' },
      { field: 'residual', title: 'Residual', type: 'number' },
    ],
    columnsPer: 1, chartHeight: 400,
    chartTypeModules: ['decomposition'],
    charts: [{ type: 'decomposition', observed: 'observed', trend: 'trend', seasonal: 'seasonal', residual: 'residual', title: 'A series and its parts' }],
  }),
}),