bug#27864: [request] safety to prevent `rm -rf ~`

[R0b0t1]

I recently had a script create a file named "~" when I passed it a
value for an installation directory. Without thinking the next command
I typed was the one in the title. Luckily this was not my main
computer and was a virtual machine.

It does not seem likely a user will ever intentionally type `rm -rf
~`. Deletion of home directories usually takes place as another user.
Most of the arguments used for the addition of --no-preserve-roots and
the `rm -rf /` safeties also seem to apply in this case, as just as
one could erroneously type `rm -rf / directory` one could type `rm -rf
~ /directory` (or even the impressive yet redundant `rm -rf ~ /
directory`).

R0b0t1.