Two new functions, CFU_NAO() and CFU_plotbox(), has been added to CFU_Rfunc.

CFU_NAO() computes the North Atlantic Oscillation (NAO) index based
on the projection onto the pattern of the leading observed EOF mode.
See the extensive description in the header of the function.

CFU_plotbox() produces a time series of the obs vs. box-and-whisker plots of
the re-forcast for a specific target period.
See the extensive description in the header of the function.