moreutils and parallel conflict because of /usr/bin/parallel and the man pages
associated.

The one in community/parallel have a lot more features than the one provided
by community/moreutils and it can provide a complete replacement (with a
different syntax) that the one in moreutils. For example

moreutils:
parallel -j 3 echo -- 1 2 3 4

parallel:
parallel -j 3 echo ::: 1 2 3 4

But moreutils have a lot of other utils that are very useful. I like to
install both and I think this can be useful.

I propose to rename /usr/bin/parallel in one of then (as a precedence,
community/mupdf do the same thing because of conflicts with extra/popper).

Now, gnu parallel (the one packaged as community/parallel) have a configure
option to add a prefix or suffix, I used this when the package are in aur,
e.g., `--program-prefix=g` change the binary to /usr/bin/gparallel *and* the
man pages also. Clean.

I prefer to change the name of the version with less features, i.e., the one
in community/moreutils. But moreutils is older in the repo, so it can have a
name priority.

What you guys think?