generator: In non-C bindings, generate '*_opts' alias.

In C, a function called 'func' which has once_had_no_optargs=true will
(because of the previous commit) generate 'func_opts' and a
backwards-compatibility function called 'func'.

This commit changes some of the non-C bindings so that they also
generate 'func_opts' which is merely a wrapper that calls 'func'.

This avoids incompatibility when we rename 'mkfs_opts' etc back to
plain 'mkfs', and it also makes it easier to translate between other
language bindings and C code.

NB: Some bindings do not include aliases:

  PHP:     There's no way to easily alias methods in PHP < 5.3, and we
           can't assume everyone has this minimum version.

  GObject: Very complex to add aliases, but we should probably do this
           at some point.

  Haskell: No support for optargs in these bindings.  Unfortunately
           this means that we can no longer bind 'Guestfs.add_drive'
           (since it will be changed to add optional arguments) making
           the Haskell bindings even less useful than they were already.

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