redundancy in description of 'cp -a'

[Benno Schulenberg]

Hi,

Since option -d of 'cp' includes the function of -P, mentioning the 
latter in the description of option -a is redundant and therefore 
slightly confusing, as the reader tries to figure out what it adds.

-  -a, --archive                same as -dpPR\n\
+  -a, --archive                same as -dpR\n\

(To save the reader the looking up of -d, -p and -R, it might be 
useful to add after -dpR that this means --no-dereference
--preserve=links,mode,ownership,timestamps --resursive.  However, 
that might give a wrong idea about the meaning of -p.)

Benno