[toplevel] Remove unusable option -notop

Maxime points out that -notop cannot be used as the kernel requires
all constants to belong into a module. Indeed:

```
$ rlwrap ./bin/coqtop -notop
Coq < Definition foo := True.
Toplevel input, characters 0-23:
> Definition foo := True.
> ^^^^^^^^^^^^^^^^^^^^^^^
Error: No session module started (use -top dir)
Coq < Module M. Definition foo := True. End M.
Module M is defined
Coq < Locate foo.
Constant If you see this, it's a bug.M.foo
  (shorter name to refer to it in current context is M.foo)
```

My rationale for the removal is that this kind of incomplete features
are often confusing to newcomers ─ it has happened to me many times ─
as it can be seen for example in #397 .

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