brewer.pal.Safe: Return color brew palettes, but fail hard if number of requested colors
is larger than the palette is holding.
Description
Internally calls 'brewer.pal(n, palette)', checking 'n' beforehand.
Usage
brewer.pal.Safe(n = 3, palette = "Set1")
Arguments
palette
Name of palette (e.g. "set1")
Value
character vector of colors