Revert commit 18796b6aea453bdeef1ad12ce80eeb220bf01e67, close 3080

This reverts 18796b6aea453bdeef1ad12ce80eeb220bf01e67 (Slight change
in the semantics of arguments scopes: scopes can no longer be bound to
Funclass or Sortclass (this does not seem to be useful)).  It is
useful to have function_scope for, e.g., function composition.  This
allows users to, e.g., automatically interpret ∘ as morphism
composition when expecting a morphism of categories, as functor
composition when expecting a functor, and as function composition when
expecting a function.

Additionally, it is nicer to have fewer special cases in the OCaml
code, and give more things a uniform syntax.  (The scope type_scope
should not be special-cased; this change is coming up next.)

Also explicitly define [function_scope] in theories/Init/Notations.v.

This closes bug #3080, Build a [function_scope] like [type_scope], or allow
[Bind Scope ... with Sortclass] and [Bind Scope ... with Funclass]

We now mention Funclass and Sortclass in the documentation of [Bind Scope]
again.

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