Ggplot Lasagna plotter
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| X | a matrix: each row a subject, each column a time/location across subjects; preferably rownames are the ids. | 
| col | colors. See "Escaping RGB Land" and the vignette for the colorspace package for followable advice on colors. | 
| axes | (logical) TRUE invokes the default axes from image(). FALSE invokes best guess (to be better defined later) | 
| main | as in plot(), the text of the title. Defaults to "(A) Initial Lasagna Plot" | 
| main.adj | the value for 'adj' in title(). Defaults to 0, which is left-aligned. | 
| cex.axis | the cex.axis value if 'axes' is FALSE. | 
| gridlines | (logical ) default TRUE. | 
| legend | (logical) defaults FALSE. | 
| ... | Additional stuff to be passed to  | 
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