Description of problem:
If both -i and -f options (in that order) are specified to cp then cp should not
act interactively. Conversely, if -f and -i options (in that order) are
specified then -f should be ignored.

Version-Release number of selected component (if applicable):
coreutils-6.9-9

How reproducible:
Always

Steps to Reproduce:
1. unalias cp
2. touch a b
3. cp -i -f a b
4. cp -f -i a b
  
Actual results:
3. prompts
4. prompts

Expected results:
3. no prompt
4. prompt

Additional info:
In a sense -i and -f are complimentary.  That is, -i means ask, and -f means
don't ask.  Often users will alias cp='cp -i' to avoid clobbering files.  But
then when they really want to overwrite files unconditionally they will use 'cp
-f' which will translate to 'cp -i -f'.  While it is entirely possible to use
'\cp -f' that assumes that the user is fully conscious of any cp alias in effect.

It would make a lot more sense to have both -f and -i use the same internal
flag, rather than distinct "unlink_dest_after_failed_open" and "interactive",
and thereby the final -i/-f would be the flag that endures.