cp command will copy to subdirectory without appending /

[Todd Partridge]

The cp command will copy to a subdirectory without an appending /

mkdir test test2
touch abc test
touch bcd test2
cp -R test2 test
ls test
test2 abc

Since the cp command can also rename I think the proper behavior here
for 'cp -R test2 test' would be to error and print that 'Folder
already exists'.  Appending a / would imply the directory:

cp -R test2 test/

This usage will remove the ambiguity of the command between the copy
function and the rename function.

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