mm users: proposed changes to HU and INDP macros

[G. Branden Robinson]

Hi folks,

For groff-next (meaning: groff after 1.23.0), I'd like to propose the
following small changes to GNU mm.

o The m (mm) macro package's `HU` macro now supports a second argument
  as a GNU extension.  It corresponds to the optional third argument of
  the `H` macro.

o The m (mm) macro package's `IND` macro (a GNU extension), now calls
  `SK` only if no `TXIND` macro is defined, instead of performing this
  action as part of the fallback when no `TYIND` macro is defined.

Any comments or objections?

Regards,
Branden

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