plotWaveletGraph: Plot wavelet spectrum summary graph
In mc30/wasp: Wavelet Analysis for Spatial Patterns

Plots a summary graph with three subgraphs: timeline of case series, wavelet spectrum and overall wavelet power.

1 2	plotWaveletGraph(wts, cases, i, units = 12, period = 1, periodRange = c(0.2, 4), bLog = FALSE)

`wts`	A list of wavelet spectrum objects.
`cases`	A matrix with case series.
`i`	A row number (i.e. location) for plotting.
`units`	Number of time units in one period (e.g. months in a year) (X axis)
`period`	The period we are interested in.
`periodRange`	The range of periods to plot.
`bLog`	Logical; if `TRUE` adds a line of logged cases.