mosaic_wrap: Wrap a data.frame into a mosaic_df, with options
In vbonhomme/Momosaics: Plots and shapes as mosaics

Given a list of shapes or directly an existing data.frame, calculates loci positions (row and col columns, for their ids) then decuces real coordinates (xc and yc columns).

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mosaic_wrap(df, nr, nc)

mosaic_wrap_factor(df, f, nr, nc)

`df`	`data.frame` with `shp` column as a `list` of shapes, and possibly other columns (eg a `factor`) or directly a `list` of shapes
`nr`	`integer` the number of rows for the mosaic plot
`nc`	`interger` the number of columns for the mosaic plot
`f`	`factor` for grouping structure