trying but failed to break up code chuncks

The "new" version is at the end, all commented
Plotting updated - faster from disk, colors fixed
Plot can now handle rasters between 0 and 1

If the setcolors has only 2 colors (i.e., 0 and 1), which would be the
default behaviour, Plot will now handle this, by making a color ramp
from these two values.
Bug fix when overplotting
bug fix of a bug fix
bug fix Plot
Bug fixes
plotting and intro & plotting vignettes
plotting vignette as rmd file; bug fixes
plotting pdf